An adverb clause has a subject and a verb, but it does not express a complete thought; it is subordinate or dependent. It acts as an adverb, modifying a verb, adjective, or adverb in the sentence. Adverb clauses are placed before or after the independent clause of the sentence.
Adverb clauses are introduced by subordinating conjunctions.
Common Subordinating Conjunctions
Punctuating with adverb clauses:
When the adverb clause comes before the independent clause, a comma is used:
Before he knew Wes, he didn't play soccer.
A comma is not used when the adverb clause comes after the independent clause:
He didn't play soccer before he knew Wes.
Use your Elements of Language textbook: Refer to pages 173-176 for more on adverb clauses.
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