Obligation and Prohibition: Have to / Must/ Should
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Do you think we should / ought to text Dad to tell him we'll be late?
Do you think we should / ought to text Dad?
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.
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