It could/would have been worse, we could have lost the match!
Could have
You should be more careful next time. You could/would have been killed.
Could have been
I should/would have loved to come to your party, but I was sick.
Would have
I missed the flight but it could/should have been worse, it would/should have been the last one.
Could have
I wish I could have/should have come to dinner last night, but I was working.
Could have
I didn't get the exam result I wanted I should/would have studied harder.
Should have
You (buy) some milk at the shops. We don't have any milk.
Should have bought
They (be) kinder to me. They were absolutely cold.
Could have been
The children (do) their homework last night. Then they wouldn't be panicking on the way to school.
Should have done
Andrew (go) to Cambridge University, but he decided to travel instead.
Could have gone
You (be) rude to him. He's going to be really angry now.
Shouldn't have been
Our neighbours (cut) down the tree in their garden. It was a really beautiful tree.
Shouldn't have cut
