[语法]“couldhavedone”不一定表示虚拟语气哦！

[语法]“couldhavedone”不一定表示虚拟语气哦！
could have done 是英文中常见的句型，不一定是虚拟语气哦！有两种基本含义：
1.表示主观猜测：
即对已经发生动作或已经存在的状态作出主观上的猜测，通常可译为“可能（已经)”，有时需根据具体语境来翻译。

如：
Tom could have taken the money; he was here alone yesterday. 有可能是汤姆把钱拿走了，昨天他单独一个人在这里呆过。

We knew he couldn’t have paid for it, because he had no money. 我们知道不可能是他付了这笔钱，因为他没钱。

2.表示“本来可以”，但事实上并没有：
通常译为“本来可以”。

如：
The worst of it is that I could have prevented the accident. 最糟糕的是我本来可以防止这次事故的。

I could have passed my examination easily but I made too many stupid mistakes. 我本可以轻易通过考试，但我犯了太多不该犯的错误。

有时也可根据语境译为“好在没有”、“差点”，尤其是当谈论的是“不好”的情况时。

如：
She felt miserable. She could have cried. 她感到很痛苦，她差点哭了。

Why did you throw the bottle out of the window? Somebody could have been hurt. 你为什么把瓶子扔出窗外呢？好在没有砸伤人。

还可以用来表达一种责备的语气：
You could have started a little earlier. 你本可早点动身的。

You could have helped me—why did you just sit and watch?你本来可以帮我一把嘛——为什么你只是坐在那儿观望呢?。