there be(is/are/was)用于完整的句子,例如:
There is a ball under the chair. 椅子下面有一个球。
而there to be和there being则用于某些动词之后,there being还可以用于独立主格结构作状语。
例如:
I expect there to be a party tomorrow. 我希望明天开派对。
There being no movie ticket left, we went home, disappointed.