Obligation (necessity): You must call them., They have got to stay home., Sandra had to buy the ticket online., They can't break the rules., We are not allowed to turn off our cameras., Advice: You had better leave early., Your friends should be more careful., The students ought to have more control., You should have saved more money., My dad ought to have called the doctor., Expectation: You are supposed to take a gift., My friends were to follow the rules., Ana was supposed to wear formal clothes., You are not supposed to cheat in the exam., We were not supposed to leave a tip., Suggestion: You could buy roses., You might offer money., Your friends might call beforehand., No obligation (No necessity): You don't have to wear formal clothes., We didn't have to wait for the police.,

AG1 UNIT 4 Modals classification Grammar presentation page 55

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