賓語從句的時態(tài)

　�。�1）  若主句是一般現(xiàn)在時、一般將來時或祈使句時，賓語從句根據(jù)句子的意義使用需要的時態(tài)。如：

　　We don’t know who has broken the window. But we will find out who has done that.

　　Please tell me where we will go.

　�。�2）       若主句是一般過去時，賓語從句要用相應(yīng)的某種過去時態(tài)，如一般過去時、過去進(jìn)行時、過去將來時或過去完成時。如：

　　He said: I’m a student. ----- He said that he was a student.

　　The teacher asked: What is Mike doing? ----- The teacher asked what Mike was doing.

　�。�3）  若賓語從句敘述的是客觀真理或永恒不變的規(guī)律，則應(yīng)采用一般現(xiàn)在時，不受主句時態(tài)的限制。如： Our teacher said that the earth moves round the sun.

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