含宾语从句的复合句,主、从句谓语动词的时态呼应应包括以下三点内容:
1)如果主句的谓语动词是一般现在时,从句的谓语动词可根据需要,选用相应的任何时态。
I don't know when he will come back.
我不知道他将何时回来。(从句为将来时)
He tells me that his sister came back yesterday.
他告诉我他姐姐昨天回来了。(从句为过去时)
2)如果主句的谓语动词是过去时,宾语从句的谓语动词只可根据需要,选用过去时态即一般过去时、过去进行时、过去将来时或过去完成时的某一种形式。如:
She asked me if I knew whose pen it was.
(从句为过去时)
He said that he was listening to the music at that time.
(从句为过去进行时)
3)如果宾语从句所表示的是客观事实、普遍真理、自然现象或习惯性动作等,不管主句用什么时态,从句时态都用一般现在时。
The teacher said that the earth goes round the sun.
老师说地球绕着太阳转。
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.
注意:
if和when既可以引导宾语从句,也可以引导状语从句,应注意它们在两种从句中的意思和用法的不同。
if和when引导宾语从句时,分别意为“是否”和“何时”,其时态应和主句时态相呼应;它们引导状语从句时,意思分别为“如果,假如”和“当……时候”,当主句时态是一般将来时时,其时态用一般现在时。它们常常放在含有状语从句和宾语从句的题干中进行综合考查。
Do you know when he will come back tomorrow ?
你知道他明天什么时候回来吗?
Sorry,I don't know.When he comes back,I'll tell you.
对不起,不知道。当他回来了,我将告诉你。
I don't know if he will come.
我不知道他是否会来。
He will come if it doesn't rain.
如果不下雨,他会来的。
简化宾语从句常用六法
同学们常会遇到把含有宾语从句的复合句转化为简单句,使其与原句意思相同(或相近)的试题。
下面就介绍几种常用的简化宾语从句的方法:
方法一:当主句谓语动词是hope, decide, wish, choose, agree, promise等,且宾语从句的主语与主句主语一致时,宾语从句可简化为不定式结构。
Li Ming hopes he will be back very soon.
→Li Ming hopes to be back very soon.
We decided that we would help him.
→We decided to help him.
方法二:当主句谓语动词是know, learn, remember, forget, tell等动词,且主句主语与从句主语一致时,宾语从句可简化为“疑问词+不定式”结构。
She has forgotten how she can open the window.
→She has forgotten how to open the window.
注:当主句谓语动词是tell, ask, show, teach等动词,且后带双宾语,从句主语和间接宾语一致时,宾语从句可简化为“疑问词+不定式”结构。
Could you tell me how I can get to the station?
→Could you tell me how to get to the station?
方法三:当主句的谓语动词是order(命令),require(需要)等时,如果主句和从句的主语不一致,宾语从句可简化为“名词(代词)+不定式”结构。
The headmaster ordered that we should start at once.
→ The headmaster ordered us to start at once.
方法四:某些动词后的宾语从句,可以用介词加动名词(短语)等其他形式简化。
He insisted that he should go with us.
→He insisted on going with us.
The poor boy doesn’t know when and where he was born.
→The poor boy doesn’t know the time and the place of his birth.
方法五:某些动词后面的宾语从句可转化为“宾语+V-ing形式(作宾语补足语)”结构。
Liu Ping found that there was a wallet lying on the ground.
→ Liu Ping found a wallet lying on the ground.
方法六:动词seem后的宾语从句,也可以用不定式(短语)来简化,但句型需要进行适当的变化。
It seemed that the boys were going to win.
→The boys seemed to win.
除上述方法外,还有一些特殊句式的转化。
I found that it was difficult to learn English well.
→I found it difficult to learn English well.
Soon we found that the ground was covered with thick snow.
→Soon we found the ground covered with thick snow.
They found that the box was very heavy.
→They found the box very heavy
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