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简介：
1.划线提问：There is a book on the desk.
what is on the desk?
2.变一般疑：There is a pen on the desk.
Is there a pen on the desk?
3.变否定句：There is a map on the wall.
There is not a map on the wall.
4.变同义句：There isn' t any water in the bottle.
There is no water in the bottle.
5.变复数句：There is a box on the floor.
There are some boxes on the floor.
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