When should an adverb clause be separated from the rest of the sentence by commas? List the two cases.

An adverb clause should be separated from the rest of the sentence by commas if it acts as an introduction and when it's placed in the middle of the independent clause.

Explanation:

An adverb clause is a subordinate clause that acts as an adverb. Adverbs are words that modify (describe) verbs, adjectives, and other adverbs.

There are two instances when an adverb clause should be separated from the rest of the sentence by commas:

c is a symbol. when bernice gets her hair cut, it is the authors way of showing the affects and demands of pier pressure and the over-all attitudes of people at the time.