例句：
1、 A lot of good deeds have been done by him.
他做了很多好事。
2、These projects have been finished already.
这些项目已经完成。
3、The work had not been done very thoroughly.
这工作做得不太认真。
4、They saw the job had been done.
他们看到工作已经做了。
5、She knew it would be difficult to undo the damage that had been done.
她知道想要消除已经造成的.损害是很难的。
6、He was angry at finding that nothing had been done.
当他知道没有啥事做出来生起气来。