问题补充：
1、He can swim.改否定句 2、The boys are playing football 改一般疑问句 3、She is to1、He can swim.改否定句 2、The boys are playing football 改一般疑问句 3、She is to music 改否定句
答案：
He can not swim.
Are the boys playing football?
she is not to music.最后这个好像怪怪的
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