For the verb "BE" exchange the subject and the verb.
They are happy ---> Are they happy?
You are a student ---> Are you a teacher?
For other verbs: add "Do" or "does" in front of the sentence.
For he/she, we use "does" and no more -s at the end of the verb
You want to go home ---> Do you want to go home?
She loves dancing ---> Does she love dancing