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Difficulty: MediumCommas with Lists, Clauses, and Coordinate Adjectives

While investigating the acoustic properties of ancient amphitheaters, acoustics engineers measured sound decay across the spacious, stone theater, and they documented how subtle architectural details enhanced vocal clarity.

Which choice for the underlined portion best conforms to the conventions of standard written English?

  1. A
    NO CHANGE
  2. spacious stone theater, and theyAnswer
  3. C
    spacious stone theater and they
  4. D
    spacious stone theater; and they

Answer

spacious stone theater, and they
The correct response leaves 'spacious stone' unpunctuated because 'spacious' and 'stone' are cumulative adjectives modifying 'theater'. In addition, it properly places a comma before the coordinating conjunction 'and' because it joins two distinct independent clauses.

Step-by-Step Solution

1
Determine whether the adjectives modifying 'theater' are coordinate or cumulative.
The adjectives 'spacious' and 'stone' are cumulative because 'stone theater' forms a single unit modified by 'spacious'. Consequently, no comma should separate them.
Cumulative adjectives cannot be reordered or joined with 'and' naturally, making punctuation between them grammatically incorrect.
2
Analyze the sentence structure following the noun phrase to evaluate clause boundaries.
The sentence contains two complete independent clauses ('acoustics engineers measured...' and 'they documented...') connected by the coordinating conjunction 'and'.
Standard written English requires a comma before a coordinating conjunction when it links two independent clauses.

Key Concept

Distinguishing cumulative adjectives from coordinate adjectives and punctuating compound sentences with coordinating conjunctions.
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Topics

Commas with Lists, Clauses, and Coordinate Adjectives

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