首先我们明白,must 是情态动词,late 是形容词.
如果是You must not late again tomorrow.则是情态动词直接接形容词,这不符合语法.正确的语法是be动词后跟形容词.由于must是情态动词,后面的be动词必须是原型,所以就变成了You must not be late again tomorrow.
You must not be late again tomorrow.为什么要加be动词?
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