this is an eraser 改复数

this is an eraser 改复数 this is an eraser 变复数.快 It is pen复数.和this is an eraser复数.还有he isboy复数 is this your an eraser? This is her an eraser.与This is her eraser. This is an eraser 对an eraser 提问 This is an eraser That is a This is an eraser.(改为否定句) 句型转换改为复数this is an eraser.what's this in English?He is my fe 将下列句子由单数变为复数形式或由复数变为单数形式 ：1.This is an eraser . 单复数句型转换It is a bag.Is that an eraser?What's this in English? 初一英语句型转换单数句改为复数句That is an eraser.This isn't my friend.She i