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Reply to "mustn't vs needn't"

Hi, Ayman,

Although they are similar, the underlying message when you use "mustn't" is "don't do it," so there seems to be a stronger personal involvement on the part of the speaker, while the message underlying the use of "needn't" is "there's no need to it."

So, we can say that they both can work here in such a context but with different implications, right?

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