Question

Your math instructor would have been happy to give you a mak

Answer 1

had you gone 是虚拟语气的一种形式,它是倒装的,但可以把它正过来：

if you had gone and explained that your parents were ill at the time 要是当时你能去解释说你父母当时病了的话.

这是一个虚拟过去的虚拟语气,套用了句型：

If I had done something,I would have done something.