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Could/ Could have done, B) **could (not can) for actions that are not…

- - - - SỬ DỤng COULD HAVE DONE ĐỂ NÓI VỀ QUÁ KHỨ:
        
        1) Nói về điều UNREALISTIC
        
        ex: i'm so tired now, i could sleep for a week ( now)
        
        ex2: I was so tired last week, i could have sleep for a week at that time ( Past )
        
        2) Giả định về một điều trong quá khứ có thể xảy ra, nhưng mà sự thật thì không xảy ra .
        
        ex: The situation is bad, but it could be worse, (now)
        
        ex: The situation was bad, but it could have been worse, (past)
        
        ex3: Why did you stay at a hotel when you were in Paris? You could have stayed with Sarah,
        
        (you didn't stay with her)
        
        ex4: David was lucky. He could have hurt himself when he fell, but he's OK.
        
        D) COULD HAVE DONE