Talking about an obligation/prohibition : You must hand in your reports by Friday, You mustn't talk during the exam, We had to write two compositions for the exam, Giving strong advice/recommendations: You mustn't give up hope, You'll love this new product! You must try it!, Making deductions about the past: He must have ran out of money. , Predicting something in the future because it seems likely: It's a great idea, so I think it should be successful , They just got a big investor, so they ought to be alright, Criticize someone: You should show more respect to old people, you know!, You ought to be more careful, John!, Giving weaker advice: I think you should talk to John. He might be able to help., You ought to invest in Bitcoin, or perhaps something else., Talking about habitual actions in the present: Elon will often sleep in his office., Talking about the habitual past: Tesla would often feed pigeons in his free time , Elon used to work for Paypal,

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