Use who for subjects and whom for objects, like this,Originally Posted by tachi
EX: John is nice.
=> Who is nice? (Subject)
EX: John saw Mary.
=> John saw whom? (Object)
EX: I gave John a book.
=> I gave whom a book? (Object)
EX: I gave a book to John.
=> I gave a book to whom? (Object)
Note, these days speakers often omit the letter/sound "m" from "whom", so you'll probably see and hear forms like this,
EX: John saw Mary.
=> John saw who? (Object)
EX: I gave John a book.
=> I gave who a book? (Object)
EX: I gave a book to John.
=> I gave a book to who?
tachi
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