Obligation and prohibition

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You (don't have to / mustn't) use your phone in quiet zones.

You (mustn't) use your phone in quiet zones.

Do you think we (should / can) text Dad to tell him we'll be late?

Do you think we (should) text Dad to tell him we'll be late?

You (don't have to / mustn't) send text messages when you are driving?

You (mustn't) send text messages when you are driving?

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