Question

Expand the underlined phrase into a clause in the sentence given below:
Before going to bed, take your pills.

• A. NO CHANGE
• B. After going to bed
• C. Before you go to bed
• D. Though you go to bed

Answer 1

Answer: (C)

Before you go to bed

An adverb clause is a group of words containing a subject and a verb, and it functions as an adverb, by modifying an adjective, verb or an adverb. Adverb clauses generally begin with a subordinate conjunction (since, because, while, etc.)
Generally, while expanding an adverb phrase to a clause, the subject is added and the present participle (verb + ing) is changed into a verb. (If there is an auxiliary/helping verb required, it is added.)
The underlined words form a phrase, it has no subject. Hence the sentence needs to be changed and option A is incorrect.
Option C is correct because the subject "you" is added and the verb "go" replaces the present participle "going".
Option B is incorrect because it's still a phrase.
Option D is incorrect because the adverb has been changed to "though", which isn't relevant to the sentence.
Note: An adverb phrase may or may not contain an adverb, as long as it functions as one.