Must not and Need not
"Must' expresses the absolute necessity of an action. For example:
You must get up at seven.
To mean that something is forbidden:
Incorrect : You need not get up at seven.
Correct : You must not get up at seven.
To mean that something is unnecessary:
Incorrect : You must not go there.
Correct : You need not go there.
Note: "You must not get up at seven' means that you must stay in bed and getting up at seven is forbidden for you, while "you need not get up at seven” indicates that you are free to get up when you like.
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