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Subject-Modifier Agreement

36 questions

All types36Multiple choice19Fill in the blank17
Question 1Question →

Having completed a detailed archaeological excavation of the ancient ruins, _______

Which choice completes the text so that it conforms to the conventions of Standard English?

Show answer & explanation

Answer: the research team discovered a collection of clay tablets detailing regional trade agreements.

Answer

the research team discovered a collection of clay tablets detailing regional trade agreements.
The correct answer is the option starting with 'the research team' because it places the logical subject that performed the action of the introductory modifier ('Having completed a detailed archaeological excavation of the ancient ruins') immediately after the comma, resulting in a grammatically correct sentence.

Step-by-Step Solution

1
Identify the introductory modifying phrase.
The introductory phrase is 'Having completed a detailed archaeological excavation of the ancient ruins.' This phrase describes an action that requires a logical agent (whoever performed the excavation).
Standard English conventions require that the subject immediately following an introductory modifier must be the noun or pronoun that the modifier logically describes.
2
Determine the logical subject of the modifying phrase.
The research team is the logical agent that would complete an excavation.
An archaeological excavation is performed by people, such as researchers or a research team, rather than tools or the tablets themselves.
3
Select the option that places the logical subject immediately after the modifying phrase.
The option that begins with 'the research team' correctly aligns the modifier with its subject.
Structuring the sentence this way avoids a dangling or misplaced modifier.

Key Concept

Subject-Modifier Agreement
Question 2Question →

In 2021, geologist Dr. Elena Vance led an expedition to retrieve mineral samples from the remote floor of the Mariana Trench. Using a high-resolution scanning electron microscope to examine the specimen, _______

Which choice completes the text so that it conforms to the conventions of Standard English?

Show answer & explanation

Answer: Dr. Vance identified unusual crystalline structures that suggest past hydrothermal activity.

Answer

Dr. Vance identified unusual crystalline structures that suggest past hydrothermal activity.
The introductory modifying phrase 'Using a high-resolution scanning electron microscope to examine the specimen' describes an action that must be performed by a person. The option beginning with 'Dr. Vance' correctly places the logical subject immediately after the comma, ensuring clear and conventional sentence structure.

Step-by-Step Solution

1
Analyze the introductory modifying phrase to determine its logical subject.
The phrase is 'Using a high-resolution scanning electron microscope to examine the specimen.' The logical agent performing this action must be a person, specifically Dr. Vance.
An introductory modifier must describe the subject of the main clause that follows it.
2
Select the option that places the logical subject immediately after the modifying phrase.
The correct option starts with 'Dr. Vance,' making her the grammatical subject of the sentence.
This positioning satisfies the rule of subject-modifier agreement and prevents a dangling modifier.

Key Concept

Subject-Modifier Agreement
Question 3Question →

Having analyzed the chemical composition of the glaze on the earthenware fragments excavated at the ancient Roman site, _______

Which choice completes the text so that it conforms to the conventions of Standard English?

Show answer & explanation

Answer: archaeologists determined that the clay had been sourced from a local volcanic deposit.

Answer

archaeologists determined that the clay had been sourced from a local volcanic deposit.
The introductory modifying phrase 'Having analyzed the chemical composition of the glaze...' describes an action. The noun immediately following the comma must be the entity that performed this action. Since archaeologists are the ones who conducted the analysis, the clause must begin with 'archaeologists.' This structure ensures correct subject-modifier agreement.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine the entity performing the action.
The phrase is 'Having analyzed the chemical composition of the glaze...', which represents an action that requires a conscious agent (the analyzer).
Understanding the function of the modifier allows us to identify the logical subject.
2
Evaluate the choices to find which one puts the logical subject immediately after the modifier.
Only the option starting with 'archaeologists' correctly places the logical agent directly after the comma.
This positioning avoids a dangling or misplaced modifier error.

Key Concept

Subject-Modifier Agreement
Question 4Question →

Complete the passage by filling in the blank with the correct pronoun or name that ensures proper subject-modifier agreement.

Fill in the blanks below

Albert Einstein is widely known for his theory of relativity, but his contributions to quantum mechanics were also monumental. Having explained the photoelectric effect in 1905, was awarded the Nobel Prize in Physics in 1921.
Show answer & explanation

Answer

he (or Einstein / Albert Einstein / the physicist / the scientist)
The correct answer provides a subject (such as 'he' or 'Einstein') that directly performs the action of the introductory modifier 'Having explained the photoelectric effect in 1905.' This alignment maintains grammatical coherence and avoids a dangling modifier.

Step-by-Step Solution

1
Identify the introductory modifying phrase in the sentence.
The modifying phrase is 'Having explained the photoelectric effect in 1905,' which is a participial phrase.
To ensure correct modifier agreement, the noun or pronoun immediately following the comma must be the logical subject performing the action in the modifying phrase.
2
Determine the logical subject of the modifying phrase.
The person who explained the photoelectric effect in 1905 is Albert Einstein.
Since Einstein is the one who performed the action, the main clause must start with a subject that refers to him (such as 'he' or 'Einstein') rather than an inanimate object or a different person.
3
Fill in the blank with the appropriate subject pronoun or name.
Using 'he' or 'Einstein' establishes a clear and grammatically correct connection, avoiding a dangling modifier.
This aligns the modifier directly with its logical subject, satisfying standard English conventions.

Key Concept

Subject-Modifier Agreement
Estimated Time:1m 0s
Question 5Question →

Although previous models of Martian geologic history suggested the planet's core cooled rapidly, recent research presents a different timeline. Using a newly developed numerical simulation to model the thermal evolution of early Martian crustal reservoirs, _______

Which choice completes the text so that it conforms to the conventions of Standard English?

Show answer & explanation

Answer: planetary scientists have identified a surprisingly prolonged period of volcanic activity, thereby providing an explanation for the planet's asymmetric topography.

Answer

planetary scientists have identified a surprisingly prolonged period of volcanic activity, thereby providing an explanation for the planet's asymmetric topography.
The introductory modifying phrase 'Using a newly developed numerical simulation to model the thermal evolution of early Martian crustal reservoirs' describes an action. The noun immediately following the comma must be the logical actor performing this action. Since planetary scientists are the ones using the simulation, the main clause must begin with 'planetary scientists'. The correct option properly establishes this relationship, ensuring subject-modifier agreement.

Step-by-Step Solution

1
Identify the introductory modifying phrase and its logical subject.
The modifying phrase is 'Using a newly developed numerical simulation...', and the logical actor performing this action must be 'planetary scientists'.
An introductory participial phrase must modify the subject of the main clause.
2
Evaluate the subject of the main clause in each choice.
Only the option beginning with 'planetary scientists' provides the correct logical subject immediately following the comma.
Placing any other noun (like 'the simulation', 'a surprisingly prolonged period', or 'the identification') as the subject creates a dangling or misplaced modifier error.

Key Concept

Subject-Modifier Agreement
Question 6Question →

Complete the text by filling in the blank with the phrase that conforms to the conventions of Standard English (specifically, subject-modifier agreement). Enter either 'reactive oxygen species (ROS) are now known' or 'scientists now know that reactive oxygen species (ROS) are'. Do not include a period at the end of your entry.

Fill in the blanks below

Long considered a mere byproduct of cellular respiration, to play a critical signaling role in pathways regulating cell survival.
Show answer & explanation

Answer

reactive oxygen species (ROS) are now known
The introductory modifier 'Long considered a mere byproduct of cellular respiration' describes a substance or entity that is produced during respiration. Logically, this describes 'reactive oxygen species (ROS)'. To avoid a dangling modifier, the noun phrase 'reactive oxygen species (ROS)' must serve as the subject of the main clause and immediately follow the comma. The phrase 'reactive oxygen species (ROS) are now known' satisfies this requirement.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine its logical target.
The phrase is 'Long considered a mere byproduct of cellular respiration'. The entity that was historically considered a byproduct of respiration is 'reactive oxygen species (ROS)'.
An introductory modifying phrase must logically describe the subject of the main clause that immediately follows it.
2
Evaluate the proposed options to identify which one places the logical target as the subject of the main clause.
The phrase 'reactive oxygen species (ROS) are now known' begins with the logical target, whereas 'scientists now know...' begins with 'scientists' as the subject.
Placing 'scientists' immediately after the comma incorrectly implies that the scientists themselves were considered a byproduct of cellular respiration, creating a dangling modifier.

Key Concept

Subject-Modifier Agreement
Question 7Question →

Complete the passage with the noun or pronoun that is logically described by the introductory modifying phrase.

Fill in the blanks below

Manatees are large, slow-moving aquatic mammals that inhabit warm coastal waters. Using its powerful tail to propel itself through the water, grazes on seagrass and other marine plants.
Show answer & explanation

Answer

The correct answer is a noun or pronoun representing the manatee (such as 'the manatee' or 'it') because the introductory modifier 'Using its powerful tail to propel itself through the water' must describe the subject immediately following it.
The introductory phrase 'Using its powerful tail to propel itself through the water' describes the entity that is actively swimming and using its tail. The correct subject to fill the blank must be 'the manatee' (or a pronoun referring to it) to ensure that the modifying phrase logically describes the subject of the main clause, avoiding a dangling modifier.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine what it describes.
The modifying phrase is 'Using its powerful tail to propel itself through the water'. It describes an entity that has a tail and uses it to swim.
An introductory modifier must logically describe the subject of the clause that immediately follows it.
2
Determine the logical subject from the context of the sentence.
The preceding sentence establishes that manatees are large aquatic mammals. A manatee is the entity that uses its tail to swim.
Ensuring subject-modifier agreement requires placing the noun being modified directly after the modifier.
3
Fill in the blank with a noun or pronoun that correctly identifies this subject.
The blank should be filled with 'the manatee' (or a pronoun like 'it') to serve as the subject of the verb 'grazes'.
This completes the main clause while maintaining correct subject-modifier agreement.

Key Concept

Subject-Modifier Agreement
Question 8Question →

Complete the academic passage by filling in the blank with a noun or pronoun that correctly completes the sentence according to the conventions of Standard English.

Fill in the blanks below

In her 2023 monograph on the ancient Maya, historian Dr. Beatriz Gomez scrutinized the agricultural terraces of the Copán Valley. Having meticulously mapped the distribution of these stone-walled fields, argued that Maya farming practices were far more sustainable than previously assumed.
Show answer & explanation

Answer

The blank must be filled with a subject that can logically perform the action of mapping the fields, such as 'Dr. Gomez', 'Gomez', 'she', or 'the historian'.
The sentence begins with the introductory participial phrase 'Having meticulously mapped the distribution of these stone-walled fields'. For the sentence to be grammatically correct, the subject of the main clause must be the entity that performed the mapping. Since Dr. Beatriz Gomez is the historian who conducted this research, a noun or pronoun referring directly to her must occupy the subject position.

Step-by-Step Solution

1
Identify the introductory modifying phrase.
The modifying phrase is 'Having meticulously mapped the distribution of these stone-walled fields'.
This phrase describes an action that must be performed by the subject of the main clause.
2
Identify the logical agent of the action.
The person performing the mapping is the historian, Dr. Beatriz Gomez.
Only a person (the historian) can map agricultural fields; objects like the monograph or the fields themselves cannot.
3
Select a noun or pronoun representing the agent to place immediately after the modifier.
Placing 'Dr. Gomez', 'Gomez', 'she', or 'the historian' immediately after the comma resolves the dangling modifier.
This alignment ensures subject-modifier agreement in accordance with Standard English conventions.

Key Concept

Subject-Modifier Agreement
Estimated Time:1m 30s
Question 9Question →

Complete the sentence with the proper subject so that it conforms to the conventions of Standard English, ensuring that the introductory modifying phrase logically describes the subject.

Fill in the blanks below

Designed by the architect Antoni Gaudí, has been under construction in Barcelona since 1882.
Show answer & explanation

Answer

the Sagrada Família
The introductory participial phrase 'Designed by the architect Antoni Gaudí' must logically modify the subject of the main clause. The basilica 'the Sagrada Família' is the entity designed by Gaudí, making it the grammatically correct subject to place immediately after the modifier.

Step-by-Step Solution

1
Identify the introductory modifying phrase and its logical target.
The phrase 'Designed by the architect Antoni Gaudí' describes a specific structure or building designed by Gaudí.
An introductory modifier must logically describe the subject that immediately follows it.
2
Determine the correct subject that fits both the modifier and the context of the sentence.
The iconic basilica 'the Sagrada Família' is the famous building designed by Gaudí that has been under construction in Barcelona since 1882.
Placing 'the Sagrada Família' immediately after the comma ensures that the modifier correctly describes the subject of the main clause, avoiding a dangling modifier.

Key Concept

Subject-Modifier Agreement
Question 10Question →

Complete the text by filling in the blank with a noun phrase that conforms to the conventions of Standard English (specifically, subject-modifier agreement).

Fill in the blanks below

Using sticky, glistening droplets to trap unsuspecting insects, survives in nutrient-poor bogs by extracting nitrogen directly from its prey.
Show answer & explanation

Answer

the sundew plant (or a similar noun phrase identifying the plant itself as the subject)
The introductory phrase 'Using sticky, glistening droplets to trap unsuspecting insects' is a participial modifier that must describe the grammatical subject that follows it. Since the sundew plant is the entity that uses these droplets, the main clause must begin with a noun phrase representing the plant (such as 'the sundew plant' or 'the plant') to maintain subject-modifier agreement.

Step-by-Step Solution

1
Analyze the introductory modifying phrase.
The phrase 'Using sticky, glistening droplets to trap unsuspecting insects' describes an action.
To identify what entity must serve as the subject of the sentence.
2
Determine the logical subject of the action.
The sundew plant is the entity that uses sticky droplets to trap insects.
To ensure the modifier logically and grammatically aligns with the subject of the main clause.
3
Formulate the subject noun phrase to fill the blank.
The noun phrase 'the sundew plant' (or 'the plant') is placed directly after the modifier.
This establishes correct subject-modifier agreement and avoids a dangling or misplaced modifier.

Key Concept

Subject-Modifier Agreement
Question 11Question →

Originally cultivated in the Andean highlands for its nutritious seeds, _______

Which choice completes the passage so that it conforms to the conventions of Standard English?

Show answer & explanation

Answer: quinoa is now grown by farmers worldwide due to its ability to tolerate diverse soil conditions.

Answer

quinoa is now grown by farmers worldwide due to its ability to tolerate diverse soil conditions.
The introductory modifying phrase 'Originally cultivated in the Andean highlands for its nutritious seeds' describes a crop. The option beginning with 'quinoa' correctly places the logical subject immediately after the comma, satisfying the subject-modifier agreement rule.

Step-by-Step Solution

1
Identify the introductory modifying phrase and the noun it logically describes.
The modifying phrase 'Originally cultivated in the Andean highlands for its nutritious seeds' must describe a crop or plant (quinoa), not farmers, popularity, or cultivation.
An introductory modifying phrase must be immediately followed by the noun it logically modifies to avoid a dangling or misplaced modifier.
2
Evaluate the choices to find the one where the logical subject immediately follows the modifier.
The option beginning with 'quinoa' is the only choice that correctly places the logical subject immediately after the comma.
Placing 'quinoa' at the beginning of the main clause ensures that the modifier correctly and logically describes the subject.

Key Concept

Subject-Modifier Agreement
Estimated Time:1m 0s
Question 12Question →

Although many people associate lavender primarily with modern aromatherapy, its cultivation dates back over two thousand years. Known for its sweet scent and vibrant purple flowers, _______

Which choice completes the passage so that it conforms to the conventions of Standard English?

Show answer & explanation

Answer: lavender is cultivated by gardeners around the world.

Answer

lavender is cultivated by gardeners around the world.
The introductory phrase 'Known for its sweet scent and vibrant purple flowers' is a modifier that must logically describe the noun 'lavender'. The correct option is the only choice that places 'lavender' immediately after the comma, ensuring correct subject-modifier agreement.

Step-by-Step Solution

1
Identify the introductory modifying phrase and its logical subject.
The modifying phrase is 'Known for its sweet scent and vibrant purple flowers'. The logical subject being described is the plant 'lavender'.
According to English grammar rules, an introductory modifying phrase must be immediately followed by the noun it modifies.
2
Evaluate the choices to see which one begins with the logical subject.
Only the option beginning with 'lavender' places the correct subject immediately after the modifier.
Other choices place 'gardeners', 'the cultivation of lavender', or 'cultivating lavender' directly after the comma, creating dangling or misplaced modifiers.

Key Concept

Subject-Modifier Agreement
Question 13Question →

Having been long dismissed by contemporaries as mere collectors of botanical specimens rather than active contributors to scientific theory, _______

Which choice completes the passage so that it conforms to the conventions of Standard English?

Show answer & explanation

Answer: early nineteenth-century women botanists actually shaped the development of evolutionary biology through their meticulous documentation of plant hybridization.

Answer

The correct answer is the option starting with 'early nineteenth-century women botanists', which correctly identifies them as the subject of the introductory modifying phrase.
The correct choice is the option that begins with 'early nineteenth-century women botanists'. The introductory modifying phrase 'Having been long dismissed by contemporaries as mere collectors of botanical specimens rather than active contributors to scientific theory' describes people. Therefore, the main clause must begin with the noun phrase representing these people ('early nineteenth-century women botanists') to maintain proper subject-modifier agreement.

Step-by-Step Solution

1
Analyze the introductory modifying phrase at the beginning of the sentence.
The phrase 'Having been long dismissed by contemporaries as mere collectors of botanical specimens rather than active contributors to scientific theory' describes people who could be dismissed as collectors (i.e., women botanists).
Identifying the logical subject of the modifier is the first step in resolving modifier agreement.
2
Evaluate the beginning of each answer choice to find the noun or pronoun that the modifier logically describes.
The noun phrase 'early nineteenth-century women botanists' is the only logical match.
The conventions of Standard English require that an introductory modifier be placed immediately before the noun or pronoun it modifies to avoid dangling or misplaced modifiers.
3
Select the choice that starts with the correct subject and maintains grammatical flow.
The choice beginning with 'early nineteenth-century women botanists' is the only one that places the logical subject immediately after the comma.
Other choices place 'the development of evolutionary biology', 'meticulous documentation', or 'scientific journals' as the subject, which creates dangling or misplaced modifiers.

Key Concept

Subject-Modifier Agreement
Question 14Question →

Hoping to document the migration patterns of monarch butterflies, _______

Which choice completes the text so that it conforms to the conventions of Standard English?

Show answer & explanation

Answer: Elena Vance, a biologist, placed tiny tracking tags on the insects' wings.

Answer

Elena Vance, a biologist, placed tiny tracking tags on the insects' wings.
The introductory phrase 'Hoping to document the migration patterns of monarch butterflies' is a modifying phrase that must logically describe the subject of the main clause. The subject who is hoping to document the migration is the biologist Elena Vance. Therefore, the main clause must begin with the noun phrase 'Elena Vance' to ensure proper subject-modifier agreement.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine what or who it logically describes.
The modifying phrase 'Hoping to document the migration patterns of monarch butterflies' describes a person who has this hope, which is the biologist Elena Vance.
A modifying phrase must be placed next to the noun or pronoun it logically modifies to avoid a dangling modifier.
2
Select the option that begins with the logical subject described by the modifying phrase.
The option starting with the proper noun 'Elena Vance' correctly aligns the subject with the modifier.
This alignment ensures that the sentence follows the conventions of Standard English regarding subject-modifier agreement.

Key Concept

Subject-modifier agreement requires that an introductory modifying phrase be followed immediately by the noun or pronoun it logically modifies.
Question 15Question →

In the mid-twentieth century, ecologists generally assumed that kelp forests were stable ecosystems that could withstand significant environmental fluctuations. However, recent studies on marine trophic cascades have challenged this view. Observing the rapid collapse of kelp canopies following the local extinction of sea otters, __________

Which choice completes the text so that it conforms to the conventions of Standard English?

Show answer & explanation

Answer: marine biologists realized that top-down predatory control is crucial for maintaining coastal biodiversity.

Answer

marine biologists realized that top-down predatory control is crucial for maintaining coastal biodiversity.
The introductory modifying phrase 'Observing the rapid collapse of kelp canopies following the local extinction of sea otters' describes an action that must be logically performed by the subject of the main clause. The group performing the action of observing is the marine biologists. Therefore, the main clause must begin with the noun phrase 'marine biologists' as its subject. The option beginning with 'marine biologists' correctly establishes this relationship, making the sentence grammatically sound.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine the entity that logically performs the action described.
The action of 'observing' must be performed by a conscious observer, which in this context is 'marine biologists'.
An introductory participial phrase must modify the subject of the clause that immediately follows it.
2
Evaluate the subject of each option to find the one that begins with the logical subject.
Only the option starting with 'marine biologists' provides the correct logical subject immediately following the modifier.
Placing any other noun or phrase immediately after the modifier creates a dangling or misplaced modifier error.

Key Concept

Subject-Modifier Agreement
Question 16Question →

Complete the text by filling in the blank with the correct phrase from the options in parentheses: (Claude Monet painted / Claude Monet's paintings depicted). Which phrase conforms to the conventions of Standard English?

Fill in the blanks below

In the late nineteenth century, Impressionist artists sought to move away from traditional studio painting in order to study the natural world directly. Hoping to capture the fleeting effects of light and atmospheric conditions, the Rouen Cathedral at dozens of different times of day.
Show answer & explanation

Answer

Claude Monet painted
The introductory phrase 'Hoping to capture the fleeting effects of light and atmospheric conditions' is a participial modifier. Under Standard English conventions, an introductory modifying phrase must logically describe the subject that immediately follows it. Because an artist (Claude Monet) is the one who can logically hope to capture light, the main clause must begin with 'Claude Monet'. The phrase 'Claude Monet painted' correctly places the logical subject immediately after the modifier.

Step-by-Step Solution

1
Identify the introductory modifying phrase at the start of the sentence.
The phrase is 'Hoping to capture the fleeting effects of light and atmospheric conditions,' which is a present participial phrase.
Recognizing the modifier is necessary to determine what noun it must logically describe.
2
Determine the logical subject of the modifying phrase.
The entity doing the 'hoping to capture' must be a person, specifically the artist Claude Monet, rather than his paintings.
Standard English requires that an introductory modifier logically describe the subject that immediately follows it.
3
Evaluate the parenthetical choices to see which one correctly begins with the logical subject.
The phrase 'Claude Monet painted' starts with the correct subject 'Claude Monet'. The phrase 'Claude Monet's paintings depicted' starts with 'paintings', causing a dangling modifier.
Matching the modifier to the correct noun ensures the sentence conforms to Standard English conventions.

Key Concept

Subject-Modifier Agreement
Question 17Question →

Complete the text by filling in the blank with the word or phrase that conforms to the conventions of Standard English.

Fill in the blanks below

To investigate the composition of Saturn's rings, the Cassini spacecraft was launched in 1997. Having traveled for nearly seven years to reach the gas giant, began transmitting unprecedented data back to Earth in 2004.
Show answer & explanation

Answer

the spacecraft (or 'Cassini' / 'it')
The introductory modifier 'Having traveled for nearly seven years to reach the gas giant' describes the entity that physically journeyed to Saturn. The Cassini spacecraft (referred to as 'the spacecraft', 'Cassini', or 'it') is the only noun that logically fits this description. Placing it immediately after the comma satisfies the rule of subject-modifier agreement.

Step-by-Step Solution

1
Identify the introductory modifying phrase.
The modifying phrase is 'Having traveled for nearly seven years to reach the gas giant'.
Understanding what the modifier describes is the first step to resolving subject-modifier agreement.
2
Determine the logical subject of this modifier.
The entity that traveled for nearly seven years to reach Saturn is the Cassini spacecraft.
The modifier must directly describe the subject that performs the action of traveling.
3
Fill the blank with a noun or pronoun representing this logical subject.
The sentence is completed with 'the spacecraft', 'Cassini', or 'it'.
This ensures that the subject matches the introductory modifier, preventing a dangling modifier.

Key Concept

Subject-Modifier Agreement
Question 18Question →

Complete the text by filling in the blank with the appropriate subject pronoun or noun phrase that conforms to the conventions of Standard English subject-modifier agreement.

Fill in the blanks below

In 1928, Paul Dirac formulated a relativistic wave equation to describe the behavior of the electron. Though initially dismissed by contemporary physicists as a mathematical curiosity with no physical relevance, is now recognized as a foundational equation in quantum mechanics.
Show answer & explanation

Answer

The blank must be filled with a noun phrase or pronoun that refers directly to the equation (such as 'the Dirac equation', 'this equation', or 'it') to ensure it agrees with the introductory modifying phrase 'Though initially dismissed by contemporary physicists as a mathematical curiosity with no physical relevance.'
The introductory modifying phrase 'Though initially dismissed by contemporary physicists as a mathematical curiosity with no physical relevance' must logically describe the subject that immediately follows it. In this context, the entity that was dismissed as a mathematical curiosity is the relativistic wave equation. Therefore, the blank must be filled with a noun phrase or pronoun referring to the equation (such as 'the Dirac equation' or 'it') to establish correct subject-modifier agreement.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine what it logically describes.
The modifying phrase is 'Though initially dismissed by contemporary physicists as a mathematical curiosity with no physical relevance.' The entity that was dismissed as a 'mathematical curiosity' is the relativistic wave equation formulated by Paul Dirac, not Paul Dirac himself or the contemporary physicists.
According to the rules of subject-modifier agreement, the subject of the main clause must immediately follow the introductory modifier and must be the entity that is logically described by that modifier.
2
Select a subject noun phrase or pronoun that refers to the equation to fill the blank.
Noun phrases like 'the Dirac equation', 'this equation', or the pronoun 'it' correctly identify the equation as the subject of the main clause.
This alignment prevents a dangling modifier and ensures that the sentence is grammatically correct and coherent.

Key Concept

Subject-Modifier Agreement
Question 19Question →

Using a high-resolution scanning electron microscope to examine the fossilized leaves, _______ Which choice completes the text so that it conforms to the conventions of Standard English?

Show answer & explanation

Answer: the paleontologists identified tiny structures indicative of ancient symbiotic fungi.

Answer

the paleontologists identified tiny structures indicative of ancient symbiotic fungi.
The correct option begins with the noun phrase 'the paleontologists,' which is the logical subject of the introductory modifying phrase 'Using a high-resolution scanning electron microscope to examine the fossilized leaves.' This placement ensures that the modifier correctly and clearly describes the entity performing the action.

Step-by-Step Solution

1
Identify the introductory modifying phrase and its logical subject.
The phrase is 'Using a high-resolution scanning electron microscope to examine the fossilized leaves'. The logical subject who performs the action of 'using' the microscope to 'examine' the leaves must be the researchers, or the paleontologists.
An introductory modifying phrase must logically describe the noun or pronoun that immediately follows it.
2
Evaluate the choices to find which one places the logical subject immediately after the comma.
Only the correct option begins with 'the paleontologists', establishing a logical and grammatically correct modifier-subject relationship.
Placing any other noun (such as 'tiny structures', 'the microscope', or 'the analysis') immediately after the comma creates a dangling or misplaced modifier, as those nouns cannot logically perform the action of using a microscope.

Key Concept

Subject-Modifier Agreement
Question 20Question →

Complete the text by filling in the blank with the correct phrase from the options in parentheses that conforms to the conventions of Standard English.

Fill in the blanks below

A pioneer of modern dance who rejected the rigid constraints of classical ballet, sought to express raw human emotion through natural, fluid movements. (Isadora Duncan / the choreography of Isadora Duncan)
Show answer & explanation

Answer

Isadora Duncan
The introductory modifier 'A pioneer of modern dance who rejected the rigid constraints of classical ballet' is an appositive phrase that must describe a person. The name 'Isadora Duncan' refers to the dancer, making it the grammatically correct subject of the main clause.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine the noun it logically describes.
The introductory modifier is 'A pioneer of modern dance who rejected the rigid constraints of classical ballet.' This appositive phrase must logically modify a person.
An introductory appositive modifier must directly describe the subject of the main clause that immediately follows it.
2
Compare the subject options to see which one represents the logical subject of the modifier.
The name 'Isadora Duncan' refers to the actual dancer (a person), while 'the choreography of Isadora Duncan' refers to her artistic works.
Only Isadora Duncan herself can be described as a 'pioneer' who 'rejected' ballet constraints, so she must be the subject of the sentence.

Key Concept

Subject-Modifier Agreement
Estimated Time:1m 0s
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