itis D的问句为什么是what is it而不是what is this

为什么是What is this 而不是This is what? what is this ?It is a pen而不是It is pen.但为什么what's this? It's 为什么是what color is it?而不是what is color is it（英语） 求解tell me what kind of bird this is?为什么是this is而不是is this? 为什么是what great fun it is!而不是what a great fun it is! Then what is it used ,do you know?这里为什么是is it?而不是it is? what do you think is it?为什么是is it而不是it is what is 的问句 为什么是what fun it is to.而不是how funn it is to. what's this?的回答为什么是it's… 为什么不用this is…回答 what is this?-It is. What is this?It is