In Nominative^x, Grammar^x, Indirect objects^x

I really need help with this grammar. It is pretty advanced. I hope you will take the time to review my question's. I know it's alot, but it is very important. I need to know the subject, the verb (whether it is an action or linking verb), the verbs compliment (Direct Object and Indirect...

I came across this sentence in a text I was issued for a seminar: "Give the package to (whoever, whomever) comes to the door." The correct response was listed as "whomever." The rationale for this was: substitute "he" or "him," as in "give the package to him." Therefore, in this sentence,...