How To Use Who Whose & Whom?

*WHO is used as a subject pronoun eg.he, she, it, etc.
WHO is used for people to ask which person has done action in a certain way.
Eg.WHO is going to cook dinner today?
-The person WHO I saw yesterday was Alex.

*WHOM is used as an Object pronoun eg. him, her, us.
It should be used to refer to the object of verb/preposition.
Eg. This is my brother WHOM you saw playing the tournament a week ago.
-She is the same lady WHOM you met in the class.

*WHOSE is a possessive pronoun.eg.his, her, ours, etc.
It is used to ask questions about who owns something.
Eg WHOSE gloves are these?
-WHOSE notebook was stolen from the class?