When should you use 'whom' or 'who' in a sentence?

Question

When should you use 'whom' or 'who' in a sentence?

Answer 1

I love this question!! Best tip is this:

If you can answer the question with 'Him' it is 'whom'.

If you can answer the question with 'he' use 'who'.

John F. Kennedy, who was assassinated in November of 1963, was the youngest president elected in the United States.

WHO was assasinated?

HE was.

John F. Kennedy, WHOM people respected for his political savvy, was assassinated in November of 1963,

Whom did they respect? HIM

Answer 2

who is the subject ... it is the same as "I"

whom is the object ... it is the same as "me"

Who do you want to win?  (subject of the sentence)

With whom do you want do go to the dance?  (object of the preposition with)  NOTE:  "Whom do you want to go to the dance with" is correct because it is also the subject of the preposition with.