为什么What is this?What is that?以及What is it?都只能用It is来回答.

为什么what is that要用 it回答 what is this?-It is. What is this?It is what is this 回答 与what is that 回答用It's 还是this is and that is哪 what's this in English?怎么回答?可以用this 还是只能用It is What is it还是What is this What is this?回答：这是V.为什么不能用：It is a V.而要用:It is V. what is that?It is C.为什么是 It is? What is this?It is S.为什么回答不是 It is a S. Is this/that---?是否能用Yes,it is.来回答? what that 后面为什么用It is回答不对 what color is it回答