...I play outside, please? A. Must B. May You...clean your teeth thre times a day. A. Must B. Mustn't

May I play outside, please? — Могу ли я играть на улице, пожалуйста?

You must clean your teeth three times a day. — Вы должны чистить зубы три раза в день.

Might I play outside, please? (Past Simple).

You had to clean your teeth three times a day. (Past Simple).

Must you clean your teeth three times a day?

Who must clean his teeth three times a day?

What must you clean three times a day?

Must you or must she clean your teeth three times a day?

You must clean your teeth three times a day, must not I?