把下面四个句子班委否定句和疑问句：This is my backpack.That is her dictionary.It’s his eraser.
问题描述：
把下面四个句子班委否定句和疑问句：This is my backpack.That is her dictionary.It’s his eraser.
答
This is not my back pack. Is this my backpack
That is not her dictionary. Is that her dictionary?
It isn't his earser. Is it his eraser?
答
1 否：This isn't my backpack. 疑： Is this my backpack?
2 否：That isn't her dictionary. 疑： Is that her dictionary?
3 否： It isn't his eraser. 疑：Is it his eraser?
答
否定句就是在be动词is后加not；疑问句就是将be动词is提到句首.This is not my backpack.Is this my backpack?This is not her dictionary.Is this her dictionary?It's not his eraser.Is it his eraser?当然is not...