Examples:
We will not have picnic today because it snowed last night.
Until it stops raining, we can't play.
An adverb clause begins with a subordinating conjunction like unless, until, when, whenever, as long as, as soon as, since, etc.
Commas with adverb clauses - When an adverb clause is at the beginning of the sentence, it is an introductory clause and needs a comma separating it from the independent clause. If the adverb clause comes after the independent clause, the conjunction is enough to hold the two clauses together.
E. g. We will not have school today because it snowed
last night.
Because it snowed last night, we will not have
school today.
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