I don't know she can't play piano,________?反意疑问句该怎么改?

概念：当宾语从句主句中 主 谓是I think,I BFLIEVE,I'M SURE 等等表示第一人称推测与想法的搭配时,反义疑问句主语和谓语要和原句中从句主语和谓语相同.
不过这个句子在主句与从句都用了否定,由于关系到否定转移,这个情况一般被视为错句.而且know 在这类句式中也少见.不过题目中的句子可改为：I don't know if she can play the piano,can she?这样就通顺多了.
再讲讲用法,比如I think he is a good man,isn't he?这里反义问句主谓都与从句（he is a good man）一致,而与主句I think无关.
类似的还有I believe that we can have a good time,can't we?
I don't think he can reach it,can he?
希望对你有所帮助!

can she?
宾语从句，反义疑问句应询问从句主语，就是这样。
Good luck!
例子有很多啊
I don't think he will come, will he?
I can't believe she did so well, did she?
再来个肯定的
I'm sure he is her father, isn't h...