Present ability, I can speak three languages., Past ability, He could run very fast in high school., Permission, May I sit here?, Request, Could I borrow your pen?, Possibility, He might be at the gym., Certainty, Her car is here. She must be still at home., Impossible, This story can't be true!, Advice, You should get more sleep if you are tired., Obligation, You must wear a seat belt., Necessary, You need to bring some sweets to the party, but you don't have to., Forbidden, You mustn't smoke in school., Past habits, I would often climb trees as a kid..

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