2. Read Grammar Girl’s explanation of who v. whom at quickanddirtytips.com.
Grammar Girl’s Who v. Whom Quiz
3. Read the explanation for when to use who, whom, whoever, and whomever at ProofreadNOW.com.
Who, Whom, Whoever and Whomever Quiz 1 at grammarbook.com
4. Read the explanation of Which v. That at writersdigest.com and the explanation of the differences between that, which and who at grammarbook.com. Work through the questions and explanations for the Which, That, and Who Quiz at grammar.ccc.commnet.edu.
HANDOUT: Using the Right Word Set #3