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Zorluk: OrtaCommas with Lists, Clauses, and Coordinate Adjectives

The following sentence contains an underlined portion. Choose the option that best maintains standard written English conventions:

Although ambient noise in urban environments often disrupts wildlife communication, migratory songbirds produce louder, higher-pitched calls, and they alter their singing schedules during morning traffic hours.

Which choice produces the most grammatically correct sentence?

  1. NO CHANGECevap
  2. B
    louder higher-pitched calls, and they alter
  3. C
    louder, higher-pitched calls and they alter
  4. D
    louder, higher-pitched calls; and they alter

Cevap

The original sentence ('NO CHANGE') is correct because it properly uses a comma between coordinate adjectives and places a comma before the coordinating conjunction joining two independent clauses.
The original phrasing correctly applies punctuation rules for both coordinate adjectives and clause boundary coordination. The adjectives 'louder' and 'higher-pitched' modify 'calls' independently, requiring a separating comma. Additionally, a comma is correctly placed before 'and' because it joins two independent clauses ('migratory songbirds produce...' and 'they alter...').

Adım Adım Çözüm

1
Evaluate the adjectives 'louder' and 'higher-pitched'.
They are coordinate adjectives because their order can be reversed ('higher-pitched, louder calls') and 'and' can be inserted between them ('louder and higher-pitched calls'). Therefore, a comma must separate them.
Coordinate adjectives modifying the same noun require a comma.
2
Analyze the clause structure on either side of the conjunction 'and'.
'migratory songbirds produce louder, higher-pitched calls' is an independent clause, and 'they alter their singing schedules during morning traffic hours' is also an independent clause.
Two independent clauses joined by a coordinating conjunction (FANBOYS) require a comma before the conjunction.

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Commas with Coordinate Adjectives and Independent Clauses
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