It is smaller than the plane（改一般疑问句）We have the books（she换we）I know the young man.否定句

1、一般疑问句：Is it smaller than the plane ? 2、she 换 we :she has the books . 3、否定句：I don't know the young man .

1. Is it smaller than the plane?
2. She has the book.
补充： I don't know the young man 或者语气更重的 I never know the young man.
请采纳。

It is smaller than the plane（改一般疑问句）
Is it smaller than the plane?
We have the books（she换we）
She has the book.

It is smaller than the plane, isn't it? (反意句 )
Is it smaller than the plane?（一般疑问句)

She has the book. (用she 后 则要换成 has 单数)

I don't know the young man.(否定句)