单词释义
eg.
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。
have been done
现在完成时的被动形式，表示已经被完成
have been doing
现在完成进行时，表示到现在为止仍然在进行。
The work has been done.工作已经被完成了。强调结果
They have been playing football for 3 hours.他们已经踢了3小时的足球了。可能还未结束。
强调过程或还未完成的动作行为用have been doing现在完成进行时。
They have finished the work.
They have been doing the work for a whole day.
I have read the book.
I have been reading the book for a week.
have been
(+-ing动词)：现在完成进行式
例句与用法:
I have been away from Paris for two weeks.我离开巴黎已经两星期了。
Flowers soon faded when they have been cut.
花剪下后很快就会枯萎。
Had he not saved me, I might have been drowned.我可能溺死了，若非救了我。
He is said to have been the richest man in Taiwan.
据说他以前是台湾最有钱的人。
She is said to have been an actress about twenty years ago.
据说她在20年以前曾是一位女演员。
双语例句