This it is an eraser.这个句子该用在哪,怎么用?为什么不用This ls an eraser.

It is an eraser. It is an eraser? This it is an eraser.这个句子该用在哪,怎么用?为什么不用This ls an eraser. This is an eraser 对an eraser 提问 This is ________ eraser.Is it ________ eraser?A.a,she B.an,her C.an,she D.×,her this is an eraser 改复数 this is an eraser 变复数.快 This is an eraser.(改为否定句) This is an eraser.(改为否定句) It is pen复数.和this is an eraser复数.还有he isboy复数 Is this an eraser?yes,it is are----- ------.yes------ -------.横线怎么填? This is her an eraser.与This is her eraser.This is her an eraser.与This is her eraser.为什么不用“an”? It is an eraser in English. It is an orange eraser.改为复数 It is an eraser .改为否定句 is this an （ ）?no,it＇sa clockA,eraser　　B,key　　C,telephone This is eraser,eraser is inThis is eraser,eraser is in the pencil box.A.a;The B.an;The C.an;An D.the;The(对了,) It is an eraser in English?画线部分提问 an eraser画线【 】 【 】 it in English