I must go to the supermarket today to get Tim’s present.
obligation
Laura had to go to the bank yesterday.
obligation (past)
You don’t have to wear your school uniform tomorrow.
no obligation
They didn’t have to do their homework until Friday.
no obligation (past)
We mustn’t wear jewellery in school.
prohibition
Sara was not to drive the car without her father
prohibition
Diane can play the piano very well
ability
Fred won’t be able to get here until Sunday
ability
I may start a new course next year.
possibility
Amy could have spoken fluent German (if she had stayed in Bonn for longer).
possibility
You can finish this essay after class.
permission
May I close the window, please?
permission
Would you buy me a newspaper while you’re out, please?
requests
Luke ought not to drive so fast.
advice
Mary should have gone alone.
advice
The car should be fixed by now.
likelihood
