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Anonymous Posted 9 years ago
Grammar

Must not vs may not

He (must not / may not) do more exercise. His heart is very weak.


Which of them is your first preference? To me, "must not" is a far better choice than "may not". Its meaning is consistent, plus it has a stronger connotation. I don't think "may not" strong enough here.

  

Top answer

'may not' is too ambiguous. It could mean "Maybe he won't do more exercise". Anonymous "must not" is a far better choice than "may not".

— CalifJim

  • 'may not' is too ambiguous.
  • It could mean "Maybe he won't do more exercise".
  • Anonymous "must not" is a far better choice than "may not".
  • I agree.
  • CJ
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2 Answers
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'may not' is too ambiguous. It could mean "Maybe he won't do more exercise".

Anonymous"must not" is a far better choice than "may not".

I agree.

CJ

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I think " may not" is better
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