Question

Rewrite the sentence using an adverb phrase:
While Sonali was walking towards the lab, she found a five hundred rupee note on the floor. [Intermediate]

• A. NO CHANGE
• B. While walking towards the lab, Sonali found a five hundred rupee note on the floor.
• C. As she walked towards the lab, Sonali found a five hundred rupee note on the floor.
• D. Sonali walked towards the lab and found a five hundred rupee note on the floor.

Answer 1

The correct option is B While walking towards the lab, Sonali found a five hundred rupee note on the floor.

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 reducing an adverb clause to a phrase, the subject is removed and the verb is changed to a present participle (verb + ing). (If there is an auxiliary/helping verb attached, it is removed.)
The underlined words form a clause, with the adverb of time "while", the subject "Sonali", verb "was walking". Hence the sentence needs to be changed and option A is incorrect.
Option B is correct because the subject is removed, hence modifying the adverb clause into an adverb phrase (with the adverb of time intact).
Option C is incorrect because it is still a clause, replacing the adverb 'while' by the adverb 'as'.
Option D is incorrect because the words still form a clause; it has been changed to a coordinate clause.