could have done 用法疑惑

Then I started to dialing everyone I could think of who knew Vince, hoping someone could shed light on

how and why this could have happened.

疑问：

could have done 一般不用于肯定句，这里为什么用于肯定句呢？

could have done究竟是什么意思呢？有几种含义？本句如何翻译理解句意？

can have done不能用于肯定句；

could have done 可以用于肯定句。它的基本含义有

1. 表虚拟，本能够。。。（可实际没能）；

2. 表推测，那是可能已经。。。。

how and why this could have happened.= ... 怎么可能以及为什么会发生

mengxin Z -

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