This eraser is mine . (改为一般疑问句）______ this eraser _____ ?

是This eraser is mine还是This eraser is my? I guess this is eraser. this is eraser的意思 This is ( )eraser. ( )eraser is in the pencil case . This is an eraser 对an eraser 提问 This is my eraser. Is that_____(you) This is my eraser 改为一般疑问句. this is an eraser 改复数 Is this your eraser怎么回答 is this your eraser的同义句 this is an eraser 变复数.快 this is （ ）eraser.（ ）mine this is my eraser.改成否定句 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”? This is an eraser.(改为否定句) This eraser is mine.同意句. Is this the girl eraser改错 前面是Is this your eraser