It is likely that the person who led you through the zoo helped you to learn a lot.
I wonder what is the grammatical function of the prepositional phrase in the above sentence?
In my opinion, the phrase modifies the verb "led", so it works as an adverb. But someone told me that I could add a verb "to be" between the pronoun, you, and the phrase and it makes sense, so the phrase is the complement of the object "you".
I'm a little confused about that.