Verified answer

1. If no one came to help, we should be obliged to do the work ourselves.
2. If you put on your glasses, you would see better.
3. What should we do if they were late?
4. Would you be very angry if we didn't come?
5. Would he be very displeased if I didn't ring him up?
6. They would all be surprised if I made such a mistake.
7. If he didn't come in time, should we have to wait for him?