Use the he/him method to decide which word is correct. he = who him = whom
Who/Whom wrote the letter? He wrote the letter. Therefore, who is correct.
For who/whom should I vote? Should I vote for him? Therefore, whom is correct.
We all know who/whom pulled that prank. This sentence contains two clauses: We all know and who/whom pulled that prank. We are interested in the second clause because it contains the who/whom. He pulled that prank. Therefore, who is correct. (Are you starting to sound like a hooting owl yet?)
We want to know on who/whom the prank was pulled. This sentence contains two clauses: We want to know and the prank was pulled on who/whom. Again, we are interested in the second clause because it contains the who/whom. The prank was pulled on him. Therefore, whom is correct.
*Taken from http://www.grammarbook.com/grammar/whoVwhom.asp. The Blue Book of Grammar and Punctuation was a lifesaver for me in college.
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