句型转换I think there are some bisuits in that box.(改写否定句)This m

I think there are some bisuits in that box.(改写否定句)
I don't think there are any biscuits in that box.
This model is less expensive than that one.（同义句）
This model is cheaper than that one.
That shirt is his.（同义句）
That is his shirt.
This is my suitcase.（同义句）
This suitcase is mine.
Those pens and pencils belong to them.(同义句)
Those pens and pencils are theirs.
What`s the matter with her (同义句)
What's wrong with her?
They are Dave`s shirts.(就划线部分提问)划线部分：Dave`s
Whose shirts are they?
He wants a new bike.(就划线部分提问)划线部分：a new bike
What does he want?

I think there are some bisuits in that box.(改写否定句)
I don't think there are some bisuits in that box.
This model is less expensive than that one.（同义句）
That model is more expensive than this...

1.I don't think there are some bisuits in that box.
2.This model is cheaper than that one.
3.That shirt belongs to him.
4.This suitcase is mine.
5.Those pens and pencils are theirs.
6.What's wrong with her?
7.Whose shirts are they?
8.What does he want?