I thought Sophia would have told you something.

我认为索菲娅会已告诉你一些情况。（属于过去将来完成时态用法）

would have done sth 结构有以下2种含义

(1)would have done sth 表示过去将来时态用法，即在过去某一时间看将来某一时间完成动作或存在状态。

The party would have arrived by four o’clock. 

这一行人将于4时前到达。

She said she would have finished her exams by then. 

她说那时她会已经考完试了。

He knew by the time he arrived she would have gone home.

他知道他到时她会已经回家。

I guessed that Mother would have made some sandwiches by the time we got back.

我猜我们回来时妈妈已经做好一些三明治了。

He said he would have done with my camera by the end of next month.

他说到下月底就不用我的照相机了。

(2)would have done sth 表示对过去发生事情一种虚拟假设，属于对过去虚拟用法。

If you had come here yesterday, you would have seen him. 

如果你昨天来到这里，你就会看见他了。 

If he had taken my advice, he would have succeeded in the test.

如果他过去接受了我建议，他在试验中就已经成功了。