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时态

1、主句用一般现在时，现在进行时或一般将来时等"现在"范畴的时态时，从句的时态根据需要来用，不受主句影响。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、主句用过去时，从句用与过去相关的时态。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、从句说明的是一般真理、客观事实、自然现象、名言时，仍用现在时。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、从句中有具体时间状语，即使从句动作发生在主句动作前，仍用一般过去时。The teacher told me she was born in 1960.