Whom - косвенный (то есть любой, кроме именительного) падеж от who - кто
Of (about) whom - из которых, о котором: She had two brothers, all of whom worked at the factory.
To whom - кому, которому: The man, to whom I spoke, was quite old.
With whom - с кем, с которым: I shared the books with my friend, with whom I get on really well.
Without whom - без кого, без которого: The boy, without whom the class had gone to the theatre, was late.
From whom – от (из, у) кого, от (из, у) которого: From whom did you buy it?
Which - косвенный (то есть любой, кроме именительного) падеж от what – что
Of (about) which - из которых, о чём: They told me a lot of information, most of which I hadn't known.
To which - чему, которому: The wedding, to which we were invited, is next Saturday.
With which - с кем, с которым: I lack words, with which to express my thanks.
Without which - без чего, без которого: We had a good umbrella, without which we would have got wet.
From which - от чего, от которого, из чего, из которого: It is the day, from which the time is to begin to run.
