doing been done是什么时态
回答
爱扬教育
2022-03-20
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be+doing: 就是am/is /are+doing 表现在进行时，was/were+doing过去进行时；
have been doing 现在完成进行时,had been doing 过去完成进行时；
be+done 表被动；
have/had+done 表时态,完成时等等。
扩展资料
例句：
I soon found that the work I was doing had been done by other people& in other words, I'm wasting my time.
我很快发现我在重复别人已做过的事情，换句话说，我是在浪费时间。
What we are doing has never been done before.
我们现在做的以前从未做过。
And they don't need to spend time doing what has already been done.
而不必要浪费时间去重复别人已经做过的工作。