1. We took out time because we shouldn't be there until 11 o'clock.
2. You should have gone to see a doctor if you were feeling so ill.
3. Andy shouldn't have said that to Julie. He really upset her, didn't he?
4. I was busy last Saturday, so I couldn't have gone to his party even if I'd wanted to.
5. You didn't have to come to pick me up - there are plenty of taxis.
6. He should have arrived by now, because he left at least an hour ago.
7. We shouldn't have rushed, because we got there with plenty of time to spare.
8. If you had sprained your ankle, you couldn't have walked here.
9. You needn't have let Paul know what we were doing - he was waiting for us.
10. We could take an exam at the end of the course.