By Indirect objects, Relative pronouns

Hello.Relative clauses can only be (from a syntactic point of view) either post-modifiers of nouns/pronouns, or sentence modifiers. They are never objects; they don't modify verbs.What can be subjects or objects, WITHIN the relative clauses themselves, are the relative pronouns used (who,...

He swallowed a lot of new questions which had just occured to him, and looked instead at the thousands of narrow boxes piled neatly right to the ceiling. He | swallowed ... and looked (instead) subject | verbs joined by a conjunction (adverb) swallowed | a lot of new questions verb | complement...