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Expressing Obligation
It is obligatory
Present
- Young people must obey their parents.
- Students have to work hard.
Future
- You must see the doctor.
- You will have to see the doctor.
It is desirable
Present & Future
- People should respect the law.
- You ought to do your homework regularly.
It is undesirable
Present and Future
- You shouldn't wear heavy clothes. It is not that cold.
- You ought not to stay in bed all the time.
It is forbidden
Present and Future
- You mustn't cheat in the exam.
- You can't see that film. You are still a child.
- You may not have two tickets but only one.
PERMISSION
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