【简明语法】11.27 时态一致（在线收听） |
| 1) 如果从句所叙述的为真理或不变的事实，则永远用现在时。 At that time, people did not know that the earth moves. He told me last week that he is eighteen. 2) 宾语从句中的助动词ought, need, must, dare 时态是不变的。 He thought that I need not tell you the truth. |
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