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就近原则
be动词单复数形式要跟there be之后的第一个主语保持一致，如果第一个主语是单数或不可数名词用is，如果第一个主语是复数用are。
there 是个近视眼。
tree
cat
There is a cat under the tree.
There are three birds in the tree.
bird
请使用There be--- 描述下图
There is a big tree.
请使用There be--- 描述下图
There is a cat and two birds in front of the house.
There are two birds and a cat in front of the house.
There is a happy house.
There is a book on the desk.
There be--- 的一般疑问句
Is there a book on the desk ?
Yes, there is. / No, there isn’t.
There are some shoes under the bed.
Are there any shoes under the bed?
Yes, there are. / No, there aren’t.
规则：
is/are要提前, some 变any,其他都不变．
There be 句型的否定形式
1. There is a pencil in the pencil-box.
否定:There is not a pencil in the pencil-box.
2. There are five apples on the tree.
否定:There are not five apples on the tree.
3. There is some water in the bottle.
否定:There is not any water in the bottle.