Matt’s late. He must /should have been here by now.
should
I feel terrible about forgetting your birthday.I must /should have remembered.
should
You needn’t have done/should not have done the washing up as I was going to do that tomorrow.
needn't have done
I’m afraid you don’t have to /can’t eat on the tennis court. It’s against the rules.
can't
I _____ (travel) around the world if I ____ (win) the lottery.
would / won
If we ____ (move) to Scotland when I was a child, I ____ (have) a Scottish accent now.
had moved / would have (mixed)
If she ____ (is) really my friend, she _____ to me.
was/would not have lied (mixed)
If I ______ (be) ill, I _____ (go) to the party last weekend.
hadn't been/ would have gone
We don’t have to /mustn’t watch TV. We could do something else instead.
don't have to