• Obligation, English-File Intermediate +
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  • They don't have to / mustn't drive. There's a bus that goes there.
    They don't have to drive. There's a bus that goes there.
  • You needen't / don't have to worry about getting a ticket in advance - you can pay on the train.
    Both are correct.
  • He shouldn't / doesn't have to put a nail in the wall. It'll leave a mark.
    He shouldn't put a nail in the wall. It'll leave a mark.
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