（原创文章，转载请注明来源“秀哈英语”） 时态含义
表示就过去某一时间而言，将来某一时间之前所完成的动作。常用在虚拟语气中，表示与过去事实相反。
例句
I believed by the end of that year an advanced version of that software would have been developed, but I was wrong.
我坚信到那年年底为止，那个软件的新版本将被开发出来。但是我错了。
肯定句式would have done
1、主语第一人称
（单数）
I would have done....
（复数）
We would have done....
2、主语第二人称
（单、复数）
You would have done....
3、主语第三人称
（单数）
She would have done....
He would have done....
Lily would have done....
Tom would have done....
My mom would have done....
Your uncle would have done....
It would have done....
The dog would have done....
（复数）
They would have done....
