When do you use "who" and when do you use "whom" in a sentence?

You use who when you are talking about the person that is doing something. You use whom when talking about the person that is receiving an action.

Explanation:

Who is used as a subject. Ex: Who wants to go to the party?

Whom is used as the object. Ex: I don't know with whom I will go to the party.

i'm not good at running

honestly you should not write it the word placement is not right and this does not sound right so i think you should write it this way. the life lessons i refused to learn, taught me the hard way this sounds way better you should try it! hope this is very !