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Modal verbs - Coggle Diagram

- - - - level A
        
        May
        Might
        Could
        => not certain
        
        Can
        => general statements
      - Level B
        
        Could
        => general statements about the past
      - Level C
        
        May have Vpp
        Might have Vpp
        Could have Vpp
        => make guesses about the past
    - - Level A,B
        
        Can't (cannot)
      - Level C
        
        Can't have/ couldn't have+ Vpp => a past event was impossible
    - - Level A,B
        
        Must => show we are sure + have reason for belief
      - Level C
        
        must have/should have + Vpp => the past
  - - - Can/can't => skills/ general abilities
      - Could/couldn't + Vo=> the past
    - - could have Vpp => s.one had the ability to do sth but did not do it
  - - - Could/Would/Can/Will --> asking sb to do sthg
    - - Can I/Shall I..?
    - - Would you like to Vo/ something?
  - - - Should/Shouldn't
    - - Must => say it's necessary to do sth
      - Mustn't => prohibitions