问题描述：
把下列句子改为否定句
1、Ithink this is right.
2、He cleaned the classroom and played football that afternoon.
3.You shold drink something before you go to see the doctor.
1、Ithink this is right.
2、He cleaned the classroom and played football that afternoon.
3.You shold drink something before you go to see the doctor.
问题解答：
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