I must study. This is a tough subject. - Obligation to do sth', You mustn't trespass. - Prohibition to do sth', It might be here somewhere. Let me look for it. - Probability for sth' to happen, He ought to go to the hospital to visit his uncle. - Moral Advice, You needn't worry. She'll be fine. - Lack of necessity, She should not be late again. - Advice not to do sth', You don't have to go now.  - Not necessary to do, He had better come back before it's too late..  - Advice to do sth', I may be late next class. I tell you now just in case.  - Possibility for sth' to happen, She has to pay more attention if she wants to get better results. - Obligation to do sth', Could you open the window, please?  - Polite request , Can I go to the toilet? - Permission to do sth', It could happen again if you don't watch out!  - Possibility for sth' not to happen, I need to talk to you. I have a problem. - Necessity to do sth', He can speak three languages well. - Ability, They must not be at home yet. It's to early. - Deduction, Those keys can't be Sally's. She doesn't have a car. - Logical conclusion,

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