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modal verb (Obligation/Duty/Necessity (must= It's your duty/ you are…

- - - - Tom can play the guitar
  - - - when we graduate we'll be able to get a job
    - - I haven't got any money now, but I can pay you tomorrow
  - - - I could run fast when I was young. I was able to run fast when I was young
  - - - Although it was dark, he was able to find his way
- - - - Could more polite then can, Might is formal. May and might we use when we don't know the other person very well
  - - - May is more formal and is usually used in writing. Don't use couldn't