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Grammar (Modals Verbs (What is/isn't possible in a particular time…

- - - - must+have+participle
      - can't+have+participle
    - - must
      - can't
  - - - may+have+participle
      - could+have+participle
      - might+have+participle
    - - may / may not
      - could
      - might / might not
      - can
        
        to talk about general situations
        
        `not´ for specific situations
  - - - managed to
      - was/were able to
      - couldn't
    - - can
      - can't
    - - will be able to
      - won't be able to
  - - - should / shouldn't
      - ought to
      - suggestions and recomendations
      - had better
    - - must / mustn't (internal)
      - have to / don't have to (external)
  - - - can
      - can't
    - - will be able to
      - won't be able to
    - - could
      - couldn't