Sorry I missed ur birthday!

Happy Birthday good buddy.

*raises glass* La Chaim!

This helped me as a child learning when to use who or whom: (Colon for the list)

Who = he/she/they

Whom = him/her/them

We would not be correct to ask, "Who does this belong to?" (For two reasons actually but no need to delve into prepositional phrases)

Because we would not say, "This belongs to he" or "This belongs to she" or "This belongs to they"

rather, we would say, "This belongs to him"....

So, we should ask, "To whom does this belong?" (Note we avoided ending the sentence in the aforementioned prepositional phrase as well)


Simply, ask yourself if you were to reword a sentence, "Would you use he/she/they or him/her/them?" Then sub who or whom accordingly. You will find that after doing this only a few dozen times in natural conversation that it becomes second-nature - just as using him or he in your sentences became second nature.