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11.27 時態(tài)一致
?	1) 如果從句所敘述的為真理或不變的事實，則永遠用現在時。　 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.

　學習啦--英語語法大全