Knowing when to use WHO and WHOM is always a tricky grammar subject. We're not going to lie ... this quiz is HARD! Here are a few hints before you give it a go. 1. Try substituting HE for WHO and HIM for WHOM 2. Keep in mind that the WHO/WHOM might be in a clause (a little sentence within the sentence), so the answer may not be as obvious as you think. 3. Try to re-order the words within those sections to help you use hint #1. Okay ... GO!