The
word in the sentence in which the adverb clause modify is letter A: helmet.
Adverb
clauses or phrases are group of words used in shifting or adding meaning of a
verb, clause, adjective, or another adverb. These clauses can be used if:
firstly, a sentence contains a subject and a predicate. Secondly, when a
subordinate conjunction is used and thirdly, if it answer the ‘adverbial
questions’ – when, why, when and how. It is also further categorized to time,
place, manner, degree, condition, concession and reason.
