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Modals of Necessity - Coggle Diagram

- - - - We should invite them to the party
  - - - We should have invited them to the party
- - - - You must not smoke here (It is prohibited to smoke here)
  - - - You don't have to eat all the foot (It's not necessary to eat all the food)
- - - - Should we offer to help pay the bill? No, we shouldn't (NOT No, we oughn't
    - - should/ought to + have + past participle
        
        We should have declined gently
- - - - Only use in present and past not future
      - were supposed to=it happened
        
        We were supposed to take flowers (but we didn't)
      - weren't supposed to=it didn't happen
        
        We weren't supposed to mention the gift we'd bought (but we did)