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Modal verbs, must - Coggle Diagram

- - - - will => would
        can => could
        may=> might
        shall => should
        must, have to
  - - - can't/can => skills/general abilities; could/couldn't Vo => the past
    - - Certainty
        
        must => show we're sure + have reason for belief
      - Possibility
        
        may,might/could => not certain
      - Impossibility
        
        can't (cannot)
    - - can/can't, could, may (more formal+ polite), couldn't, may not
    - - Requests
        
        Could/Would/Can/Will --> asking sb to do sth
      - Offers
        
        Can I/Shall I..?
      - Invitation
        
        Would you like to Vo/sth?
    - - Suggestions
        
        should/shouldn't
      - Obligations
        
        must => it's neccesary to do sth
        
        mustn't => prohibitions
- - - - Possibility
        
        May have Vpp/ Can have Vpp/ Could have Vpp => make guesses about the past
      - Impossibility
        
        can't have/couldn't have Vpp => a past event was impossible
      - Certainty
        
        must/ should have Vpp => the past
    - - could have Vpp => s.one had the ability to do sth but did not do it
    - - Need (n't) have Vpp: lẽ ra nê (ko nên) làm gì