Use who as the subject, and use whom as the object. Here's a trick, the subject generally comes before the verb, and the object comes after the verb: Pat gave Max a book. Who gave whom .
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Casi:
With the passive, the subject and the object switch positions, so the object comes before the verb:
Max was given a book.
Whom was given a book?
Speakers often shorten "whom" to "who":
JTT wrote:
I'm confused by something you've said here, Casi. Are you saying that "Max" is the object in the sentence, "Max was given a book." ?