You should come. 너 와야 돼.
You should have come. 너 왔어야 돼.
It must be true. 사실인 게 틀림없어.
It must have been true. 사실 이었던 게 틀림없어.
could have pp 할 수도 있었는데.
would have pp 했었을 텐데.
should have pp 했어야 했는데.
must have pp 했던 게 틀림없어.
pp란?
broken / sold
break broke broken
sell sold sold
출처 : 야나두
