“特殊疑问词 动词不定式”的用法归纳
            “特殊疑问词＋动词不定式”的用法归纳
      一．由两部分构成：疑问词和动词不定式（wh-+to do）。疑问词部分包括疑问代词who, whom, what, which和whose以及疑问副词when,  where和how。此外，连接词“whether”也适用.它 主要具有以下几种功能：
  ⑴当主语，如：
● When to hold the meeting has not yet been decided.
● Where to live is a problem.
⑵当宾语，常接在forget, find out, discuss, decide, tell, teach, know, learn, wonder, remember等动词之后作宾语如：
● We must know what to say at a meeting.
● He could not tell whom to trust.
● Do you know how to play bridge?
　⑶当表语，如：
● The problem is where to find the financial aid.
● The question is who to elect.
⑷当名词同位语，如：
● Tom had no idea which book to read first.
● The question whether to confess troubled the girl.
⑸用于宾语补足语,双重宾语。某些动词后可接“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等如：
● I can tell you where to get this book.
● I ask her how to learn English.
● He will advise you what to do.
● Will you show me how to use the machine?
(6) 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。例如：
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$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)
二“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：
Which to choose is important. = Which we should choose is important.
 The question is where to go. = The question is where we should go.
 三、“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？
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 don’t know why to choose that dictionary.
正：I don’t 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. 肯定形式是表示某动作是不必要的或没有意义的，而否定形式是表示向某人提建议和表达看法，相当于祈使句。
Today is Sunday. Why not go out to relax yourself?
Why pay more at other shops? We have the best value.
练习：
1.I  have  no  idea  when  ___  her  the  bad  news.
          A. will  tell           B. telling               C. tell            D. to  tell
2. —Will you please show me how to do the role-play exercise?
—Sure. Now let me tell you ____ first.
A. which to do    B. how to do
C. when to do      D. what to do         
3. I need your help because I don’t know ____.
A. how to do it    B. how to do
C. what to do it    D. what should I do     
4.—How are you feeling here?
—It’s quite hot. I don’t know ____ to go or stay.
A. how          B. when
C. whether      D. where             
5.— I don’t know ____ to do with this maths problem. It’s too hard.
— You can ask your classmates or teachers for help.
A. which        B. how
present的同义词
C. what          D. when             
6. — Millie, could you give me some advice? I don’t know ____.
— Why don’t you wear this red shirt?
A. when to wear  B. what to wear
C. how to wear    D. where to wear       
7. I’m going on a field trip but I haven’t decided__________.
  A. what to doB. to do what
  C. where to go D. to go where
8 —This physics problem is too difficult. Can you show me ________， Wang Lin？
  —Sure.
  A. what to work it out
  B. what to work out it
  C. how to work it out
  D. how to work out it
9. Excuse me. Would you please tell me ________ buy a digital camera？
  A. what to      B. where to
C. what I can    D. where can I
10. There isn't any difference between the two. I really don't know ________.
　A. where to choose 　B. which to choose 　C. to choose what  D. to choose which
用“疑问词＋不定式”改写下列句子。
  1.How we should do it was discussed last night.
  __________ was discussed last night.
  2. I didn’t know where I should go.
  I didn’t know ____________.
  3. The difficulty was how we should cross the river.
The difficulty was ____________ .
　根据汉语补全下列英语译文。
  1. 何时动身还不知道。
  ____________ is unknown.
  2. 我忘了该怎么办。
  I forgot___________.
  3. 我可以告诉你哪里可以买到此书。
  I can tell you_________.
4. Yao Ming 未决定下一步做什么。
Yao Ming hasn’t decide ____________ next.
5.She has decided ____________. (到哪儿工作。)

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