what you are talking about 语法正确吗？这样说可以吗？

Question

这样说可以不可以，请详细分析一下

Answer 1

如果是一句话，它是错误的。一句话应该是：What are you talking about?完整的问句。
但是如果放在从句里，它就是正确的。如：
i don't know what you are talking about.

Answer 2

如果是疑问句，错误。应该改为：What are you talking about?追答

如果作名词性从句，正确。
I don't know what you are talking about.

Answer 3

如果是回答: I am xxx..... We are xxxx.... She is xxx....