一、“疑问词＋不定式”结构中的疑问词包括who, what, which（疑问代词）和how, when, where, why（疑问副词）等。这些疑问词和不定式一起构成了不定式短语，在句中可以作主语、宾语、表语和宾语补足语等。如： I really don”t know what to write about. 我实在不知道该写些什么。
The problem is where to put this computer.
问题是该把这台计算机放在哪儿才好。
I asked him how to learn English well.
我问他如何才能学好英语。
二、“疑问词＋不定式”结构相当于一个名词性从句，所以常常可以用同等成分的从句来代替。改写时只需在疑问词之后加上恰当的主语，并将不定式短语变成适当形式的谓语。如上述句子可以分别改写为： I really don”t know what I should write about.
The problem is where we should put this computer.
I asked him how I could learn English well.
三、“疑问词＋不定式”结构经常放在tell, show, teach, learn, know, discuss, remember, forget, find out, wonder等动词的后面作宾语。
The teacher taught the students how to do the experiment.
老师教学生们如何做这个实验。
The young woman doesn”t know what to do.
那位年轻女子不知道怎么办才好。
The farmers showed us how to plant trees.
农民们给我们示范怎样植树。
［注意］“疑问词＋不定式”结构还可以用于独立问句。如：What to do? 怎么办？
列车运行时刻表
How to get rid of the trouble?
如何摆脱困境呢？
［练习］
请用“疑问词＋不定式”结构改写下列句子。螺旋槽丝锥
1. How we should do it was discussed last meeting.
_______ was discussed last meeting.
2. I don”t know where I should go.
I don”t know ______.
3. The difficulty was how we should cross the river.
The difficulty was _______.
Key:
1. How to do it
超生反应
2. Where to go陆德明
品图3. how to cross the river
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