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Zorluk: OrtaCommas with Lists, Clauses, and Coordinate Adjectives

To evaluate how volcanic ash impacts jet turbines, aerospace engineers simulated high-altitude flight conditions, injected fine silica dust into the combustion chamber, and observed how the thermal coating on the blades degraded over time.

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

  1. NO CHANGECevap
  2. B
    conditions; injected fine silica dust into the combustion chamber, and observed
  3. C
    conditions, injected fine silica dust into the combustion chamber, they observed
  4. D
    conditions, injected fine silica dust into the combustion chamber and, observed

Cevap

The original phrasing (NO CHANGE) is correct because it properly punctuates a three-item list of parallel verb phrases with commas separating each item, including a comma before the coordinating conjunction 'and'.
The sentence features a compound predicate consisting of three parallel actions ('simulated...', 'injected...', and 'observed...'). Standard English punctuation requires separating items in a series with commas, including the comma before 'and' when completing the list. The original text follows this rule precisely.

Adım Adım Çözüm

1
Identify the grammatical structure of the sentence.
The subject 'aerospace engineers' performs three parallel actions: (1) simulated flight conditions, (2) injected silica dust, and (3) observed blade degradation.
Determining the list structure dictates proper comma placement within a series.
2
Apply comma rules for items in a series.
In standard written English, three or more items in a list must be separated by commas, with a final comma before the coordinating conjunction ('and').
A comma is required after the first item ('conditions,') and after the second item before the conjunction (', and observed').
3
Evaluate the options against standard punctuation conventions.
The original text correctly places commas after each list item preceding the conjunction, whereas the alternatives introduce semicolon fragments, comma splices, or misplaced commas.
Only the original text maintains proper coordination and list punctuation without fragmenting the sentence or splicing clauses.

Anahtar Kavram

Commas with Lists and Coordinating Conjunctions
Bu soruyu puanla

Konular

Commas with Lists, Clauses, and Coordinate Adjectives

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