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 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