there be句型
1．表示：在某地有某物或某人.
2．在there be 句型中,主语是单数或不可数名词,be 动词用is ；主语是复数,be 动词用are ；如有几件物品,be 动词根据最近be动词的那个名词决定.
There is a book on the desk.
There is some water in the glass.
There are three men under the tree .
There is a bag,two books and three pens on the desk.
3．there be句型的否定句在be 动词后加not , 一般疑问句把be动词调到句首.
There is a duck in the river. 否定句：There is not a duck in the river. 一般疑问句：Is there a duck in the river?
4．some 和any 在there be 句型中的运用：some 用于肯定句, any 用于否定句或疑问句.
5．and 和or 在there be句型中的运用：and 用于肯定句, or 用于否定句或疑问句.
6．针对数量提问的特殊疑问句的基本结构是：
How many + 名词复数 + are there + 介词短语?
How much + 不可数名词 + is there + 介词短语?
7．针对主语提问的特殊疑问句的基本结构是： What’s + 介词短语?
have,has
1．表示：某人或某物“拥有”什么东西,强调“所属关系”,而且某人某物作为句子的主语. 2．have用在人称I,we,you,they和复数的人或物后面.has用在人称he, she, it和单数和人或物后面. I have a daughter. He has a lucky dog.
There be句型与have,has有时也可以通用. 如：The classroom has ten desks. = There are ten desks in the classroom. 教室里有十张桌子.
注：不存在There has/have这种结构