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1、“特殊疑问词动词不定式”的用法一、“疑问词+不定式”结构中。疑问代词who, what, which等和疑问副词when, where, how等后面跟不定式，以及连接副词whether与不定式连用构成不定式短语（这个不定时短语相当于一个名词）。这种结构在句中可作主语、宾语、表语、宾语的补语，状语，同位语等句子成分。注意：疑问副词why后不能跟动词不定式作主语Where to go is still a question. 到哪里去还是个问题。（作主语，作主语时，谓语动词常用单数形式）Choosing what to eat is no longer as easy as it once wa
2、s. 选择吃什么,已经不像以前那么简单了。 作宾语 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） 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）作表语 The question is how to learn English well. 问题是怎样学好英语。（作表语）作宾语补语I asked her how to learn English. 我问她如何学英语。（用双宾语，宾语补足语）做状语She was at a los
3、s what to do. 她不知如何是好。（做状语）做同位语The question whether to confess troubled the girl. 是否要坦白的问题使姑娘很烦恼。（做同位语）I have no idea which one to take. 我不知道拿哪个好。（同位语）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：1，Ill show you how to do it. 我要让你看看如何做这件事。,
4、2，Youd better find out where to put it. 你最好弄清楚要把它放在哪里。作双重宾语（宾语补足语）：某些动词后面可接sb.疑问词不定式构成的双重宾语，这类动词常用的有advise, ask, show, teach, tell等。例如：He will advise you what to do. 他会建议你们做什么Will you show me how to use this machine? 你能示范教我如何使用这部机器吗？作介词宾语：某些介词后面可接疑问词不定式作宾语，这类介词常用的有 about, as, from, in, of, on, with等
5、。例如： You also need to learn the basic skills of rafting, such as how to handle the raft, how to paddle and how to get in and out of the raft. 你还需要学习基本划木筏的技巧，比如驾驭木筏的方法，划桨方法，上下木筏的方法。 He has no idea of how to answer this question. 他不知道怎样回答这个问题。 Della had only $1.87 with which to buy Jim a present. 德拉仅有
6、$1.87为来吉姆买一件礼物。(which是关系代词) You have a number of topics from which to choose. 你有很多题目可以选择。(which是关系代词)When you are trying to advise someone about what to do or what not to do, you can use should / ought to or should not /ought not to. 当你想要建议某人做什么或者不做什么时，你可以用should / ought to 或者 should not / ought not
7、 to。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：1，I dont know what Ill do next. = I dont know what to do next.2，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：1，
8、Li Ping doesnt know why to learn English. = Li Ping doesnt know why he should learn English.2，Which to choose is important. = Which we should choose is important.3，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 trou
9、ble? 如何摆脱困境？然而，这个结构看似简单，但也容易出错，有几点是需要我们注意的：易错一：按照英语语法的习惯，疑问副词why后不直接跟动词不定式。如：误：I dont know why to choose that dictionary. （X）正：I dont know why you must choose that dictionary.但它可以接不带to的动词不定式（即动词原形），构成Why do sth.?/Why not do sth? 结构。肯定形式表示某动作是不必要的或没有意义的，而否定形式则用于向某人提建议和表达看法，相当于祈使句。Today is Sunday. Why
10、 not go out to relax yourself?今天是周日，干嘛不出去轻松一下呢？Why pay more at other shops? We have the best value.为什么花更多的钱到其他商店去买？我们这里物美价廉。另外，还需要注意的是：why not这个结构的否定式通常只用于谈论现在和将来，而不用于谈论过去。如：误：Why not clean the room yesterday? （X）正：Why didnt you clean the room yesterday?易错二：有些动词可以直接跟不定式作宾语，但有些动词是不能直接跟不定式作宾语的，这些不能直接跟
11、不定式的动词它们的后面可以接“疑问词+不定式”结构作宾语。这类动词主要有：know, suggest, consider, discover, discuss, explain, understand, wonder等。如：He knowshow to play the piano. 他会弹钢琴。We never discovered how to open the box. 我们一直未发现如何打开这个盒子。Can you explain how to make a cake? 你可以给我解释一下怎么做蛋糕吗？有些动词，如tell, ask, show, advise, teach, info
12、rm等，还可以先加上一个间接宾语，之后再加上“疑问词+不定式”结构作直接宾语。如：Please tell us where to show our tickets.请告诉我们在哪里验票。Have you told him where to get the application form? 你告诉他到哪里去拿申请表了吗？易错三：“疑问词+不定式”结构，通常不用于动词think的现在式和过去式之后，但可以用于think的其他形式之后（如现在进行式），如：Im thinking what to do next. 我在想接下来要做什么。Im thinking how to use this comp
13、uter. 我在想如何使用这台电脑。 有时，此结构还可以用在有助动词的think之后，如：She couldnt think what to give the children for Christmas.她想不出圣诞节送孩子们什么礼物。易错四： 在“which+不定式”结构中，which有时可以是疑问词，那就和我们所说的“疑问词+不定式”结构一样。如：I cant decide which to choose. 我不能决定选哪一个好。Did you ask her which to buy? 你问没问她该买哪一个？ 但有时which可能是关系代词，那么这个结构就相当于一个定语从句了，此时主要用于介词之后作宾语。如：She must have time in which to grow calm. 她必须有冷静下来的时间。=She must have time in which she can grow calm.Allow me one minute in which to change my costumes. 给我一点时间来卸装。=Allow me one minute in which I can change my costumes.结束
