Obligation: We have to help others when they need us., I have to go to work next Saturday morning., John has to take care of his sister's cat tonight., No obligation: I don't have to work on Saturdays, Mary doesn't have to invite us to her wedding. She is not such a close friend of ours., Our students don't have to wear a uniform on Fridays., Rules: Students must return the books to the library in perfect conditions., We must leave the classroom perfectly organized after every class., I must send a report every two weeks. , Prohibition: We mustn't steal., Ian mustn't smoke any more or he will get really sick., Students mustn't smoke in the public areas of the campus., Suggestions: Andrew should really see a doctor. he's been sick many days., We shouldn't give money to people in the streets., Anyone should tell Anna the truth.,

MODAL VERBS OF OBLIGATION

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