Read the sentence.

The teacher offered to lend me the book as often as needed.

(as often as needed.)

Which word does the underlined phrase modify?

A) teacher

B) lend

C) book

D) me

The correct answer is option letter B. The underlined phrase "as often as needed" is a prepositional phrase functioning as an adverbial of time and, as such, it can only modify a verb, an adjective or another adverb. In this case, the adverbial of time "as often as needed" modifies the verb "lend" and it refers to how often the teacher will lend the book to someone. Options in letter A (teacher), C (book), and D (me) are nouns, which cannot be modified by an adverbial phrase.