1. The wine should be opened about three hours before you use it.
2. Bicycles mustn't be left in the hall.
3. The car might be stolen.
4. The room must be kept tidy by you.
5. The problem can't be solved by them.
1. You should open the wine about three hours before you use it.
=> The wine should be opened about three hours before you use it
2. You must not leave bicycles in the hall.
=> Bicycles mustn't be left in the hall
3. Someone might steal the car.
=> The car might be stolen.
4. You must keep the room tidy.
=> The room must be kept tidy
5. They can't solve the problem.
=> The problem can't be solved