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The passive of modal verbs, To talk about things that is necessary use the…

- - - - You should stay in the hospital with your mom.
- - - - Obligation
        
        Permission
- - - - Don't have to, don't need to
        
        Must, have to, need to
        
        Can, could (more polite), may (most polite)
        
        Might, may, can, could
        
        Can, could (past ability)
  - - - You should take a shower after visit your friends.
        
        You don't need to do the dinner for tonight.
        
        You must study the afternoon to have time in the night and sleep.
        
        Could you give me chance to go to the park?
        
        My sister might wash the dishes.
        
        You can take your bicycle and go for the park.
        
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