1.there is/are
(used with 'be')(与动词be连用, 作语法主语, 表示存在与否或引起注意)
There's a factory near my house.我家附近有一个工厂。
There are five people in my family.我家里有五口人。
How many are they?—There are three of them.他们有几个人？——三个。
There has been an accident.发生了一起事故。
We rang the hotel, but there were no vacancies.我们给宾馆打电话, 但是那里没有空房。
2.(used with other verbs)(用在某些动词前表示某物存在、发展或可见, 动词的单复数取决于其后的名词)
There appeared no imminent danger.似乎没有迫在眉睫的危险。
There rose before us the great pyramid of Giza.吉萨大金字塔矗立在我们面前。