who are you playing with?
who with are you playing?
with who are you playing?
Are they all equally correct?
Thank you
***** NOT A TEACHER **
Good afternoon.
(1) Your first one is "good" English now accepted by everyone.
(a) Of course, the "perfect" answer is "WHOM are you playing with?"
(i) The rule is very easy: ALWAYS (no exceptions) use the object form after a preposition.
(a) If you change the question to "regular" (non- question order), you can see this more clearly: You are playing WITH (preposition) + WHOM (objective form).
(2) Your second sentence is 100% UNacceptable. Even uneducated native speakers would NEVER use that order.
(3)Your third sentence would probably never be said. If a native speaker wanted to use that word order, s/he would probably "sense" that WHOM is necessary (even if s/he did not understand the rule): WITH WHOM are you playing? To whom are you speaking?
(4) In summary:
(a) Most people say: Who are you playing with? Who are you talking to?
(b) They should say" Whom are you playing with? But it is too difficult to pronounce "whom."
(c) A few people say, "With whom are you playing?" Very elegant English.
For example: Excuse me. Would you please tell me with whom you live?
(Regular English: Hey! Who do you live with?)
(d) Nowadays "whom" has almost disappeared from conversational "American" (the English language as spoken here in the States).
(i) About the only time native speakers feel the need to use it is in the phrase "To whom it may concern."
(e) Of course, educated people try to use it in written work. But even there it is sometimes not used.
Have a nice day!