been的用法和意思:been是be的过去分词,作为动词,中文含义为“是”。
been用在完成时和被动句中,其中现在完成时的构成为has/have+been/done,过去完成时的构成为had+been/done,当被动句的主语是物时,即用被动语态。
例句:
1、Scientists think that there has been life on Earth for millions of years.
科学家认为生命存在于地球已经有几百万年了。
2、They have been playing football for 3 hours.
他们已经踢了3小时的足球了。
3、I have been away from Paris for two weeks.
我离开巴黎已经两星期了。
4、There have been many changes in recent years.
近几年发生了许多变化。
5、We had to work within the parameters that had already been established.
我们必须在已设定的范围内工作。