choose the correct answer

"(who-whom)am I speaking to?"

"This is (me - she - her,"said the girl when the speaker asked to speak to Joyce.

(whoever - whomever) ate my icercream will regret it.

Who is used a subject, predicate noun.

Whom is used as any kind of object - direct object, object of preposition, indirect object.

The more grammatical way to use the first sentence is "To whom am I speaking?" Then whom is the object of to.

Whoever and whomever have the same rules as who and whom.

This is ____. Here you have a predicate noun. Which of those pronouns can be switched with "this"