FUNCTIONS [11]

    

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.