You must come to school at seven.

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You must come to school at seven.

You must come to school at seven.
You must come to school at seven.

You must come to school at seven.
You needn't come to school at seven.
原句为:你必须七点钟到学校来.
否定顺为:你不必在七点钟到学校来.
几个情态动词的否定一般就是直接加not的否定,如should/could/need.
must是个比较特殊的例子,其否定形式不是直接加否定,而是变成need再加否定.

you don't have to come to school at seven
对must(一定)的否定用don't have to
Mustn't表示禁止

must改为should not

You can't come to school after seven.
不能用mustn't 意思是禁止