Who and Whom

Rule

Use the he/him method to decide which word is correct.
he = who
him = whom

Examples

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.

Other Grammar Pages:

• Subjects and Verbs
• Subject and Verb Agreement
• Pronouns
  
• Whoever and Whomever
  
• Who v Which v That
  
• Adjectives and Adverbs
  
• Prepositions
  
• Confusing Words and Homonyms
  
• Fragments
• Capital Letters