Page 749 - Wordsmith A Guide to College Writing

4. (Who, whom) is that odd-looking person in the trench coat and
sandals?

5. Do you know (who, whom) the police plan to charge with the

crime?

Who and Whom Following a

Preposition

Sometimes, a preposition that comes before who or whom will need to
be included in your sentence for it to make sense.

? I was not sure to (who, whom) I should speak.

Step 1: Ignore everything that comes before who or whom.

I was not sure to (who, whom) I should speak.

Step 2: Substitute he for who and him for whom, and see which one

makes sense.

I should speak to he.

I should speak to him.

Since “I should speak to him” makes sense, you can now rewrite the
sentence with confidence, using whom in place of him.

I was not sure to whom I should speak.