there be 句型表示"某地有某物。"有三种形式:

1.There is a+单数可数名词+在某地.

如 There is a dog under the tree.树下有一条狗。

2.There is +不可数名词+在某地。

如 There is some water on the floor.地板上有一些水。

3.There are +名词复数+在某地。

如 There are two books on the desk.书桌上有两本书。