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1、定义：There be句型表示“存在”，“有”，“某地有某物”。与have的区别。
2、关于be：There be句型中的be动词如何确定呢？请先看看下面这首歌诀：
Be动词，有三个，am，is还有are。“There be”真特别，不留am只留俩，那就是is还有are。要用is还是are，须看其后的名词是单数还是复数。若是单数或不可数名词用is，否则就用are。
结构：一共分为三种
(1) There is +单数可数名词+ 地点状语.
There is a book on the desk.
There is an umbrella in the bag.
(2) There is +不可数名词+ 地点状语.??
There is some milk in the cup.
There is some grass on the farm.
(3) There are +复数名词+地点状语.
There are four chairs in the living room.
There are some birds in the sky.
注意事项： 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。
如：1. There is a girl and two boys in the picture.
2. There are two boys and a girl in the picture.
二：There be 句型的变化
变成否定句：
There be句型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.
注意：is not的缩写是isn’t，are not的缩写是aren’t.
1. There is a knife in the kitchen.
2. There are five apples on the tree.
3. There is some milk in the bottle.
规则：be词后面加not, some 变any
三：用be动词is / are 填空：
1.??There ________ many monkeys in the mountain.
2.?There _______ a beautiful garden in our school.
3.??There _________some water in the glass.
4.There ______a picture and two maps on the wall.
把下例句子改成否定句: