1) 如果從句所敘述的為真理或相對不變的事實(shí),則用現(xiàn)在時(shí)。例如:
At that time, people did not know that the earth moves. 那時(shí),人們不知道地球是動(dòng)的。
He told me last week that he is eighteen. 上星期他告訴我他十八歲了。
2) 賓語從句中的,助動(dòng)詞ought, need, must, dare 的時(shí)態(tài)是不變的。例如:
He thought that I need not tell you the truth. 他認(rèn)為我不必告訴你真相。
At that time, people did not know that the earth moves. 那時(shí),人們不知道地球是動(dòng)的。
He told me last week that he is eighteen. 上星期他告訴我他十八歲了。
2) 賓語從句中的,助動(dòng)詞ought, need, must, dare 的時(shí)態(tài)是不變的。例如:
He thought that I need not tell you the truth. 他認(rèn)為我不必告訴你真相。