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canwenotbesad语法对吗?not是副词,不是应该放在宾语或动词后吗?

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can we not be sad语法对吗?not是副词,不是应该放在宾语或动词后吗?
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答案和解析
can we not be sad语法是对的,not是副词,一般放在be动词、助动词及情态动词后,行为动词前,不能放在宾语后.
又如:
He is not a student .You don't have to wear so many clothes .He can't speak Japanese.
We haven't finished our homework .Jim doesn't like dancing .
此句中not本来是在can后,由于can提前了,所以not就成现在这个位置了.
此句还可说成:Can't we be sad 难道我们不能难过吗?