that is a pen /that is the pen有什么区别?

that is a pen This a pen.that is a pen,什么 that is a pen.改成一般疑问句 That is a pen.(变为复数) that is a pen (变为复数） Is that a pen?的同意句 That is her a red pen.改错 that is your pen. That is green pen what is that in English?是It is a pen还是This si a pen还是That is a pen Is __ your pen A.that B.this C.her D.his.That is his pen. that is a pen /that is the pen有什么区别? that is a green pen表语和宾语是否都是pen,其中that是主语? and what is that in your( )( is it a pen? That is her pen.改为否定句That her pen. What is that?itis a pen改为复数形式 改错:（Is ）（that ）a（ your） pen? is that a your pen?这句话错在哪儿