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- - - - Public transport should be more efficient.
        
        The tickets can be bought online.
        
        The story could be understood easily.
- - - - Public transport should not be so expensive.
        
        The tickets can't be bought online.
        
        The story could not be understood easily.
- - - - Should public transport be free?
        
        Can the tickets be bought online?
        
        Could the story be easily understood?