been的用法和意思?UK98zl 2021-10-08

been的用法和意思:been是be的過去分詞,作為動詞,中文含義為“是”。

been用在完成時和被動句中,其中現在完成時的構成為has/have+been/done,過去完成時的構成為had+been/done,當被動句的主語是物時,即用被動語態。

been的用法和意思?

例句:

1、Scientists think that there has been life on Earth for millions of years。

科學家認為生命存在於地球已經有幾百萬年了。

2、They have been playing football for 3 hours。

他們已經踢了3小時的足球了。

3、I have been away from Paris for two weeks。

我離開巴黎已經兩星期了。

4、There have been many changes in recent years。

近幾年發生了許多變化。

5、We had to work within the parameters that had already been established。

我們必須在已設定的範圍內工作。