that is( an eraser) in english.对括号内提问.my mother is (fine.) what is the english for this?（同义句转换）

Is that an eraser?的回答 It is an eraser. It is an eraser? That is ( ) eraser. --is that( )eraser?--yes,it,s( )eraser. This is an eraser That is aThis is an eraserThat is a plate变复数句 This is a pen and that’s an eraser.可不可以写成This is a pen and that is an eraser.呢? This is an eraser 对an eraser 提问 what is on the table?回答what is on the table?A It's an eraser B They're eraser C That's an eraser D The eraser 选哪个 为什么?如何理解提问主语? Is that your eraser?(改为同义句）Is----------eraser-----------? that's an eraser改为复数句 That is an eraser.变否定句、 一般疑问句RT还有肯定回答 That is my eraser.对my eraser提问 this is an eraser 改复数 It is an eraser in English. It is an orange eraser.改为复数 this is an eraser 变复数.快 This is an eraser.(改为否定句)