You uoght to have given them some advice?So I did.

问题补充：

You uoght to have given them some advice?So I did.为什么不用So I ought?

答案：

ought to have done 这里表示推测,与过去事实不相符,所以仍属于过去时态.

======以下答案可供参考======

供参考答案1:

ought to have done的意思是本应干某事（实则未干）。由些可见上文误会其未做那件事，而回答者要表述“我确实干了”So I did.表示干了