题目内容：

按要求改写句子：this cat is heavier than that dog.(改写一般疑问句） amy likes piay the piano.(改否
定句）

优质解答

楼主第二个句子打错了吧?
1.Is this cat heavier than that dog?
2.Amy doesn't like playing the piano.
或：Amy doesn't like to play the piano.
doesn't也可以全写成：does not

追问：

amy不是第三人称单数么？

追答：

是啊，所以用doesn't而不是don't来变化啊。