题目内容：

what are you talking about?为什么加的是are
问的是他们在谈论什么啊?应该用IS的吧

优质解答

这事正在进行时的用法,规则：
I AM TALKING
YOU ARE talking ----what are you talking about
HE IS talking ------what is he talking about
SHE IS talking-----what is she talking about 这两个采用is