there be+宾语+过去分词
■过去分词表示一种被动关系，同时表示动作已经发生：
There is nothing written on it. 上面没写东西。
There were ten people killed in the accident. 事故中有10人丧生。
■有时过去分词也可表示一种状态(可转换成被动结构)：
There were some old men seated (=who were seated) in the back. 有些老人坐在后面。
There is a red car parked (=which is parked) outside the house. 房子外边停着一辆红色汽车。