WHO
Who is a Subject Pronoun like "he," "she" and "we". Use it to ask which person does an action or which person is a certain way.
Examples:
- Who made the birthday card?
- Who is in the restroom?
- Who is going to eat this?
WHOM
Whom is an object pronoun like "him," "her" and "us." Use it to ask which person receives an action.
Examples:
- Whom are you going to invite?
- Whom did he hire to do the job?
WHOSE
Whose is a possessive pronoun like "his," "her" and "our." Use it to find out what belongs wot which person.
Examples:
- Whose car is this?
- Whose bird is singing?
- Whose sweater is this?
