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怎么变否定句

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怎么把一个句子变成否定句,要注意哪些要点?
怎么变否定句
解题思路: 一个句子变成否定句
解题过程:
先找这句话的动词,如果是系动词,就在系动词后加not ,如果是实义动词,在实义动词前加助动词don't , doesn't.
He is a student. He isn't a student.
My mother goes to work by bike .
My mother doesn't go to work by bike.
注意要把some 变成any.
There are some students in the classroom.
There aren't any students in the classroom.
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最终答案:略