Share 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?
A pilot (has to / must) wear a uniform when he's at work?
A pilot (has to) wear a uniform when he's at work.
You (should / must) visit the Pyramids when you're in Egypt.
You (should or must) visit the Pyramids when you're in Egypt.
I (have to / must) speak to my phone company. My last bill was wrong.
I (have to or must) speak to my phone company. My last bill was wrong.
We (don't have to / mustn't) hurry. We have plenty of time.
We (don't have to) hurry. We have plenty of time.
When I was at school we (had to / must) wear a horrible time.
When I was at school we (had to) wear a horrible time.
You (shouldn't / don't have to) walk on the grass. They've just planted flowers there.
You (shouldn't) walk on the grass. They've just planted flowers there.
