was going to do sth was going to have done sth

was going to do sth表示过去曾经计划要做的事,或者过去应当做的事,而且从现在的角度来看已经实现了.
I was a little nervous because I was going to leave my parents soon.
was/ were going to have done, 表示 “本打算”、“本计划”或“本应当” 做的事而没有做成或没有发生.如:
I was going to have seen her, but she didn’t turn up.
We were to have been married last year.