時(shí)態(tài)

1、主句用一般現(xiàn)在時(shí)，現(xiàn)在進(jìn)行時(shí)或一般將來時(shí)等"現(xiàn)在"范疇的時(shí)態(tài)時(shí)，從句的時(shí)態(tài)根據(jù)需要來用，不受主句影響。I want to know what time he got up this morning.He will tell us that he has been able to look after himself.They are saying that they really like this city.

2、主句用過去時(shí)，從句用與過去相關(guān)的時(shí)態(tài)。Kate said there was a box under the desk.They asked what he was doing then.She asked whether I had seen her before.

3、從句說明的是一般真理、客觀事實(shí)、自然現(xiàn)象、名言時(shí)，仍用現(xiàn)在時(shí)。Dad told us that it is better to do than to say.He told the boy that three and three is six.He told me the earth moves around the sun.

4、從句中有具體時(shí)間狀語，即使從句動作發(fā)生在主句動作前，仍用一般過去時(shí)。The teacher told me she was born in 1960.

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