There is/there are称为there be句型，也称为存在句型，表示事物的客观存在，there在此结构中是引导词，已经没有副词那里的含义 中文：在一个房间里有一个桌子，两个椅子。 翻. 例如： 1、there are two books on the desk. There was an old tree in front of the building two weeks ago.
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There exist 还是there exists，取决于后面主语的单复数。这实际是个完全倒装语序，exist是谓语动词，后面的名词是主语。there 起引导作用，本身无意义。 观察你的两个例.
书桌上有两本书。 2、there has been a rapid decrease in traffic accidents since 2014.
There was + 单数名词, 用于 一般过去时，表示现在某个地方有（单数的或）一个事物或一个人或某些（不可数的）事物，eg:
