This research has done much to advance our understanding of language learning.

　　這項研究大大提高了我們對語言學習的認識。

　　He has done sterling work on the finance committee.

　　他在財務委員會工作優異。

　　This man has done nothing wrong.

　　這位男子沒有做過不正當的事。

　　Any reasonable person would have done exactly as you did.

　　任何有頭腦的人都會完全照你那樣去做的。

　　He said I must have done something bad to deserve it.

　　他說我肯定是罪有應得。

　　You shouldn't have done it without consulting me.

　　你不該不和我商量就做了這件事。