This is my eraser 改成否定句 ——my eraser .

问题描述:

This is my eraser 改成否定句 ——my eraser .

This isn't my eraser.

This isn't my eraser.这不是我的橡皮
句中有 be 动词,改为否定句一般在 be 后加 not,此题 is not 可以缩写成 isn't.