Question

Which word in the sentence does the adverb clause modify?

He read that book before he watched the movie.

A.
that

B.
he

C.
read

D.
book

Answer 1

The answer is: C

The adverb clause: It contains a subordinating conjunction and explains the subject.

In this case, the adverb clause is "before he watched the movie," and it modifies "read," because it is explaining when he read. @MabelGravityFalls

Answer 2

thanks @curlette123