Question

Choose a suitable adverb clause to complete the sentence:
We have to wear light clothes .

• A. during the summer
• B. as summer has begun
• C. to prevent ourselves from feeling too hot
• D. None of the above

Answer 1

Answer: (B)

as summer has begun

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.).
Option B is correct because it is an adverb clause of reason, 'as' is a conjunction that refers to cause or reason: "summer has begun".
Option A is incorrect because it is a phrase, not an adverb clause.
Similarly, option C is incorrect because it is a phrase, not a clause.
Option D is incorrect because the answer lies in B.