Read the welcome note from your eccentric new boss and choose the correct words to complete it.

"Welcome to the team! You _____ wear a suit to the office, pajamas are perfectly fine, but you absolutely _____ touch Dave's favorite coffee mug under any circumstances."

The correct answer is don't have to / mustn't.

We use don't have to to show a lack of obligation. It means something is not necessary, but you can do it if you want to (wearing a suit is optional).

We use mustn't (must not) to show strict prohibition. It means something is completely forbidden or a very bad idea (touching Dave's mug is not allowed).