there be 句型基本认识
1、定义：
There be句型表示某处存在某物或某人。
2、结构：
(1)There is +单数可数名词/不可数名词+ 地点状语.
(2) There are +复数名词+地点状语.
注意事项：there是引导词，在句中不充当任何成分，翻译时也不必译出。句子的主语是某人或某物，谓语动词be要与主语（某人或某物）的数保持一致。
There be句型的就近原则:
当主语是两个或两个以上的名词时，谓语动词要与跟它最近的那个名词一致。如：
① There is a bird in the tree. 树上有一只鸟。
② There is a teacher and many students in ourclassroom. 我们教室里有一位老师和许多学生。
③ There are two boysand a girl under the tree. 树下有两个男孩，一个女孩。
there be 句型考点
考点一：各种句型转化。
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?
考点二：there be 句型的时态。
be可以有现在时（there is/are）
过去时(there was/were)
将来时(there is/are going to be或there will be)
