特殊疑问词加不定式
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“特殊疑问词+动词不定式”的用法归纳
一、疑问代词who, what, which等和疑问副词when, where, how等后面跟不定式,构成不定式短语。这种结构在句中可作主语、宾语、表语、宾语补足语等句子成分。如:
1. Where to go is still a question. 到哪里去还是个问题。(作主语)
2. I know where to find the boy. 我知道到哪里能找到这个男孩。(作动词know的宾语)
3. We must first solve the problem of whom to serve.
我们必须首先解决为谁服务的问题。(作介词of的宾语)
4. The question is how to learn English well.
问题是怎样学好英语。(作表语)
5. I asked her how to learn English. 我问她如何学英语。(用宾语)
二、“特殊疑问词+动词不定式”结构经常用在某些动词后作宾语,类似的动词有:tell, show, know, learn, teach, find out, forget, wonder, remember 等。如:
I’ll show you how to do it. 我要让你看看如何做这件事。
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You’d better find out where to put it. 你最好弄清楚要把它放在哪里。
三、“特殊疑问词+动词不定式”这种结构可以把复合句转为简单句。如:
I don’t know what I’ll do next. = I don’t know what to do next.
The doctor told him when he should take the medicine.
=The doctor told him when to take the medicine.
同样,因为“特殊疑问词+动词不定式”这种结构相当于一个名词性从句,所以可用同等成分的从句代替,从而把简单句转换为复合句。改写时只需在疑问词后加上适当的主语,并把不定式改为适当的形式的谓语即可。如:
Li Ping doesn’t know why to learn English.
= Li Ping doesn’t know why he should learn English.
Which to choose is important. = Which we should choose is important. The question is where to go. = The question is where we should go.
四、“特殊疑问词+动词不定式”这种结构可构成独立问句。如:
$
What to do 怎么办
How to get rid of the trouble 如何摆脱困境