could/ not/ expect/ the surprise
She couldn't have expected the surprise
The wind/ must/ blow/ the tree down
The tree must have blown the tree down.
never/ should/ allow/ him/ to speak/ to you that way
I never should have allowed him to speak to you that way.
might/ last/ go out/ I don't know
They might have gone out last night; I don't know.
should/ visit/ Big Ben/ before it got dark
We should have visited Big Ben before it got dark.
might/ not/ hear/ the news/ yet
They might not have heard the news yet.
