Question

求解英语题

I don't know she can't play piano, ________? 反意疑问句该怎么改？
能举出同类的例子更好，谢谢了
为什么主句不是I think，I know等这些时就不对宾语从句主语提问了呢？

Answer 1

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！

Answer 2

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 he?

诸如此类，其实规律还是很好找滴~
当然啦，主语是I才可以，如果是这样：

She is sure that John is cheating, isn't she?

就不是isn't he了