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Unit 9 (vocabulary (States and Politics (affairs constitutional monarchy …

- - - - Form
        
        Afer modal verb we use an infinitive without to.
      - Use
        
        must- 90% true / may, might, could, may not, mightn't - 50% / can't 90% not true
    - - Form
        
        must/may/might/could/can't/couldn't + have + past participle.
      - Use
        
        must have-90% true / may have, might have, could have, may not have, mightn't have -50% / can't have, couldn't have- 90% not true
  - - - If+past perfect,...would/wouldn't have + past participle
    - - Talk about imaginary or impossible situations in the past and their consequences.