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1、“特殊疑问词不定式的用法“疑问词+不定式构造question word + to-infinitive4） 疑问代词who, what, which等与疑问副词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在作用上相当于一个名词性从句，名词成分。这种构造在句中可作主语、宾语、表语、复合宾语的直接宾语、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一、“疑问词+不定式动词构造的几种功用： 1作主语Where to go is still a question. 到哪里去还是个问题。作主语时，谓语动词常用单数形式When to
2、hold the meeting has not yet been decided. Choosing what to eat is no longer as easy as it once was. 选择吃什么，已经不像以前那么.When to start has not been decided. 何时动身尚未决定。What to read is an important question. 该读些什么是一个很重要的问题。How to begin is more difficult than where to stop. 如何开场比到哪里停顿还困难。2） 作宾语作用相当于名词性从句A. 用
3、作动词宾语He asked how to open the box. 他询问如何翻开盒子。 She couldnt think what to say. 她想不出说什么。He could not tell whom to trust. Our teacher explained how to use the word processor. 教师向我们说明如何使用文字处理机。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B. 作于间接宾语后作直接宾语Ill show you how to do it. 我将给你讲这怎么做。She ki
4、ndly advised me what to do. 她好心的劝告我该做什么。My sister taught me how to fold paper into a crane. 我姐姐教我如何折纸鹤。C. 用作介词宾语I have no idea of how to do it. 我不知道如何做此事。Bill said something to her about what to do. 比尔给她讲了讲应当怎样做。I found a book on how to avoid having a heart attack. 我找到一本书谈如何防止心脏病复发。We must first sol
5、ve the problem of whom to serve. .为谁效劳的问题。作介词of的宾语3作表语The question is how to learn English well. 问题是怎样学好英语。作表语The problem is where to find the financial aid. The question is what to do next. 问题是下一步怎么办。The question is how to carry out the plan. 问题是怎样执行这个方案。5） 作复合宾语的直接宾语I can tell you where to get thi
6、s book. He will advise you what to do.Will you show me how to use the machineI asked her how to learn English. 我问她如何学英语。宾语补足语5作状语She was at a loss what to do. 她不知如何是好。做状语6作同位语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Tom had n
7、o idea which book to read first. 二、 “特殊疑问词动词不定式构造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, imagine, learn, decide, consider, understand, remember, think等。Eg: Ill show you how to do it. 我要让你看看如何做这件事。Youd better find out where to put it. 你最好弄清楚要把它放在哪里。注：作介词宾语某些介词后面可
8、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 He has no idea of how to answer this question. 他不知道怎样答复这个问题。 Della had only $1.87 with which to buy Jim a present. 德拉仅有$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)作复合宾语某些动词后面可以先有个宾语，然后才接适当的
9、“疑问词+不定式动词 构造即：sb.+ 疑问词 + 不定式。这类动词常用的有advise, ask, show, teach, tell, inform等，先加上一个间接宾语，之后再加上“疑问词+不定式构造作直接宾语。Eg: The chief technician showed the apprentice how to repair the machine. Have you told him where to get the application form He will advise you what to do. 他会建议你们做什么Will you show me how to u
10、se this machine 你能示范教我如何使用这部机器吗？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 to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, tea
11、ch, tell等。Eg: 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？三、“特殊疑问词动词不定式这种构造可以把复合句转为简单句。Eg: I dont know what Ill do next. = I dont know what to do next.Eg: The doctor told him when he should take the medicine.= The doctor told him when to take the
12、medicine.因为“特殊疑问词动词不定式这种构造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。Eg: Li Ping doesnt know why to learn English. = Li Ping doesnt know why he should learn English.Eg: Which to choose is important. = Which we should choose is important.Eg: The question is where to go.
13、 = The question is where we should go.四、“特殊疑问词动词不定式这种构造可构成独立问句。What to do 怎么办？How to get rid of the trouble 如何摆脱困境？该构造的注意点：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。误：I dont know why to choose that dictionary. X正：I dont know why you must choose that dictionary.但可以接不带to的动词不定式即动词原形，构成Why do sth./Why not do sth
14、构造。肯定形式表示某动作是不必要的或没有意义的，而否认形式那么用于向某人提建议与表达看法，相当于祈使句。Eg: Today is Sunday. Why 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。需要注意的是：why not这个构造的否认式通常只用于谈论现在与将来，而不用于谈论过去。误：Why not clean the room yesterday X正：Why didnt you clean
15、 the room yesterdayWhy not do sth = why dont you do sth易错二：“疑问词+不定式构造，通常不用于动词think的现在式与过去式之后，但可以用于think的其他形式之后如现在进展式Eg: Im thinking what to do next. 我在想接下来要做什么。Im thinking how to use this computer. 我在想如何使用这台电脑。有时，此构造还可以用在有助动词的think之后Eg: She couldnt think what to give the children for Christmas. 她想不出
16、圣诞节送孩子们什么礼物。易错三：在“which+不定式构造中，which有时可以是疑问词，那就与我们所说的“疑问词+不定式构造一样。Eg: 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，那么这个构造就相当于一个定语从句了，此时主要用于介词之后作宾语。Eg: 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
17、 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.易错四：1) “特殊疑问词动词不定式构造中的疑问副词后要接不及物动词；假设接及物动词, 要有动词的宾语。Eg: I dont know how to talk. 我不知如何谈。I wonder if you could tell me how to do it. 不知您能否告诉我如何去做这件事。(不能说: . how to do.)2) 有些动词可以直
18、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，这些不能直接跟不定式的动词它们的后面可以接“疑问词+不定式构造作宾语。这类动词主要有：know, suggest, consider, discover, discuss, explain, understand, wonder.Eg: 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翻开这个盒子。Can you explain how to make a cake 你可以给我解释一下怎么做蛋糕吗？3) 有些动词，如tell, ask, show, advise, teach, inform等，还可以先加上一个间接宾语，之后再加上“疑问词+不定式构造作直接宾语。Eg: 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？第 9 页