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    11.27 時態(tài)一致
  
      
  
      
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      1) 如果從句所敘述的為真理或不變的事實，則永遠用現(xiàn)在時。
      
　
At that time, people did not know that the earth moves.      
      
　
He told me last week that he is eighteen.      
      
      
      
      
      
　 
2) 賓語從句中的助動詞ought, need, must, dare 時態(tài)是不變的。      
      
　
He thought that I need not tell you the truth.            		
  
      

      

      

      

      

      

      

      

      

      

      

      



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