The boy <u>who cried during the whole</u> movie finally fell asleep.
Explanation:
Relative (adjective) clauses, as the name suggests, function as an adjective would. They attribute a quality, a characteristic, that modifies a noun. As clauses, they must have a subject and a verb. They will always start with a relative pronoun or a relative adverb.
We were asked to write a complete sentence using the correct who from to introduce a relative clause. The sentence is "The boy who cried during the whole movie finally fell asleep." The main clause is "the boy finally fell asleep", while the relative clause is "who cried during the whole movie". Notice how the relative clause modifies the noun "boy". We now know a characteristic of this boy that distinguishes it from other boys: he is the one who cried.
