把下列句子改为否定句
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.
答
I don't think this is right.
He didn't cleaned the ……
You shouldn't drink……
呵呵……想起了我的初中……