Theoretical possibility - can/could there be life on other planets?, possibility in the present or future - They might/could be waiting at the station, Possibility of past events - He might have decided to go home earlier , to say something sure in the present - That must be the new teacher, To say something sure in the past - He must have been asleep because he didn't hear the phone ringing, to say something we are sure that is not in the present - That can't be your mum, to say something we are sure is not in the past - They can't have forgotten. I only reminded them in this morning, obligation in the present or future imposed by the speaker - I must finish my assignment this weekend, prohibition in the present or future  imposed by the speaker - you mustn't forget to go to the bank, present or future obligations imposed by someone other than the speaker - I have (got) to see my tutor on Monday, obligations in the past - They told us we had to apply for the course ,

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