therebe句型的用法
There be句型是小学、初中英语学习中的重要内容，表示（某处）有(某物/人)。
基本结构为“There be +某物/人+某地”。
注意区别：表达某人有某物，要用have/has
be动词的单复数必须依主语的变化而变化。单数is，复数are
如：
There is a table in the room. 房间里有一张桌子。
There are some birds in the tree. 树上有很多鸟。
1、变成否定
There be句型的否定式的构成和含有be动词的其它句型一样，在be后加上not或no即可。注意not和no的不同：not是副词，no为形容词，not a/an/any + n. 相当于no+ n.。例如：
①There are some pictures on the wall.
→There aren't any pictures on the wall.
=There are no pictures on the wall.
②There is a bike behind the tree.
→There isn't a bike behind the tree.
=There is no bike behind the tree.
2、变成一般疑问句
There be句型的一般疑问句变化是把be动词调整到句首，再在句尾加上问号即可。但同时要注意：当肯定句中有some时，要将其改为any（否定变化也一样）。
①There is some water on Mars.
→ Is there any water on Mars?
②There are some fish in the water.
→Are there any fish in the water?
3、特殊疑问句
对主语提问：当主语是人的时候，则用who 引导，当主语是物的时候，则用what引导。注意：无论原句的主语是单数还是复数，对之提问时一般都用be的单数形式(回答时却要根据实际情况来决定)。如：
①There are many things over there.
→What's over there?
②There is a little girl in theroom.
→Who is in the room?
对地点状语提问：则用where 引导。如：
①There is a computer on the desk.
→ Where is the computer?
②There are four children on the playground.
→Where are the four children?
对数量提问：般有两种句型结构：
How many+复数名词+are there+介词短语？
How much+不可数名词+is there+介词短语？
