为什么用Is this提问,却用it is回答呢

为什么用Is this提问,却用it is回答呢 What is this?提问为什么要用“It is”回答呢?可以用this is 回答吗 用Is this 提问的选择疑问句为什么用It is 回答,而不能用This is回答 is that提问为什么用it回答 Is this you pencil 为什么不能回答 yes,this is.而是要用Yes,it is. it is an ice cream.(用what提问）回答what is this?还是what is it? What is this?回答：这是V.为什么不能用：It is a V.而要用:It is V. Is this your car?用It is回答,还是用This is回答 how is this word pronounce?为什么用is提问 Who's this用this is回答还是it is回答 what is this 回答 与what is that 回答用It's 还是this is and that is哪 为什么英语中的 Is this baby your cousin?回答要用it