助动词协助主要动词完成以下功用:
a. 表示时态，例如：
He is singing. 他在唱歌。
He has got married. 他已结婚。
b. 表示语态，例如：
He was sent to England. 他被派往英国。
c. 构成疑问句，例如：
Do you like college life? 你喜欢大学生活吗？
Did you study English before you came here? 你来这儿之前学过英语吗？
d. 与否定副词not合用，构成否定句，例如：
I don't like him. 我不喜欢他。
e. 加强语气，例如：
Do come to the party tomorrow evening. 明天晚上一定来参加晚会。
He did know that. 他的确知道那件事。

考点名称：否定句

• 否定句：
  表示否定的句子。必须有否定词。
  否定句的构成形式：
  a. 谓语为be动词时，“be+not "一名学生。
  b. 谓语为实义动词而且没有情态动词和助动词时，“do/ does/ did+not"构成否定。 
  例：I do not like dancing. 我不喜欢跳舞。 
        He does not want to go to school. 他不想去上学。
  c. 谓语为“情态动词+实义动词”时，“情态动词+not”构成否定。 
  例：You must not smoke. 你千万不要吸烟。 
         I can not catch it. 我抓不住它。

• 否定句在英语语法中可以分为九类：
  （1）一般否定句
  I don't know this. No news is good news.
  There is no person（smoking）/not a person/not any person（smoking）in the house.
  （2）特指否定
  He went to his office, not to see him.
  I am sorry for not coming on time.
  I don't think/believe/suppose/feel/imagine you are right.
  （3）部分否定
  All the answers are not right
  All is not gold that glitters
  I don't know all of them.
  I can't see everybody/everything.
  Both of them are not right.
  （4）全体否定
  None of my friends smoke.
  I can see nothing/nobody.
  Neither of them is right.
  Nothing can be so simple as this.
  （5）延续否定
  You didn't see him, neither/nor did I.
  You don't know, I don't know either.
  He doesn't know English, let alone/to say nothing of/not to speak of（更不用说）French.
  （6）半否定句
  We seldom/hardly/scarcely/barely hear such fine singing.
  I know little English. I saw few people.
  （7）双重否定
  You can't make something out of nothing.
  What's done cannot be undone.
  There is no sweet without sweat.
  No gain without pains.
  I can't help /keep/ laughing whenever I hear it.
  No man is so old but（that）he can learn.
  （8）排除否定
  Everyone is ready except you.
  He did nothing but play.
  But for your help, I couldn't do it.
  （9）加强否定
  I won't do it at all.
  I can't see it any more.
  He is no longer a boy.

• 否定转移的形式与用法：
  一、动词的否定转移
  1.形式上否定主句的谓语，实际上是否定从句的谓语
  当动词“think”、“believe”、“suppose”、“imagine”、“expect”、“feel”的主语是第一人称，谓语动词为没有任何副词修饰的一般现在时，它们的否定式实际上是对宾语从句的否定。
  表示说话者提出一种委婉的看法或主张。如：
  I think that he will help us.——I don’t think that he will help us. 我认为它不会帮助我们。
  I believe that he is right.——I don’t believe that he is right. 我认为他不对。
  I suppose that he likes it.——I don’t suppose that he likes it. 我想他不喜欢它。
  
  2. 形式上否定谓语动词，实际上否定复合宾语
  当动词“think”、“believe”、“suppose”、“imagine”、“expect”、“feel”、“find”的主语是第一人称，谓语动词为没有任何副词修饰的一般现在时，它们前面的否定式实际上是对复合宾语的否定。表示说话者所提出的一种委婉的看法或主张。如：
  I think math difficult. — I don’t think math difficult. 我认为数学不难。
  I find the story interesting. — I don’t find the story interesting. 我认为这个故事没有趣。
  I expect so. —I don’t expect so. 我认为不会。
  
  二、动词“think”、“believe”、“suppose”、“imagine”、“expect”、“feel”在下列情况下，否定不转移：
  1.这些动词跟其他另一个动词一起做并列谓语时，否定不转移。如：
  I believe and hope he won’t do that. 我相信并且也希望他将不会那样做。
  I feel and admit that we are not foolish. 我觉得并且也承认我们并不愚蠢。
  
  2.用于疑问句时，否定不转移。如：
  Do you think it is not going to rain? 你认为天不会下雨吗？
  Don’t you believe that he has done a good thing? 难道你不相信他做了一件好事？
  
  3.用作插入语时，否定不转移。如：
  Li Lei, I think, won’t be angry with you. 我想李蕾不会生你的气。
  Tom, I suppose, won’t be against it. 我猜想汤姆不会反对。
  Mike, I believe, hasn’t seen the film. 我认为迈克没有看这场电影。
  
  4.动词前有其他副词修饰时，否定不转移。如：
  I really don’t think it’s necessary for us to go there now. 我的确不认为我们有必要去那儿。
  I feel strongly that he shouldn’t do such a thing. 我强烈地认为他不应该做那样的事。
  
  5.动词为非一般现在时或主语不是第一人称时，否定不转移。
  I thought that he wouldn’t come back soon. 我原以为他不会回来得这么快。
  She didn’t believe that he became a good boy. 她不相信它变成了一个好孩子。
  He thinks that he isn’t fit for the job. 他认为他不适合这件工作。
  He doesn’t believe that what we told him is true. 他不相信我们告诉他的事是真的。
  
  6.当宾语从句中含的否定为“not……at all”、“not a little”、“not a few”、“not enough”、“can’t help”等固定搭配时，否定不转移。如：
  I think that he doesn’t know it at all. 我想他对那一点也不知道。
  I suppose that it is not enough to remember the words if you want to learn the language well. 我认为如果你想把这门语言学好，那么只记单词是不够的。
  I believe that you can’t help singing our national anthem when you win the first place in the Olympic Games. 我相信当你在奥运会上获得第一名时你会情不自禁地唱起国歌来。
  
  7.当宾语从句中含“no”、“nothing”、“nobody”、“nowhere”、“hardly”、“seldom”、“little”、“few”等否定词或半否词时，否定不转移。如：
  I believe that nothing can make me give it up. 我想任何事情也不能使我放弃。
  I think that no one can escape if the ship sinks in the sea. 我认为如果这艘船沉入海底的话，那么谁也逃不掉。
  I suppose that he is a man of few words. 我猜想他是一个言语不多的人。

考点名称：特殊疑问句

• 特殊疑问句：
  以特殊疑问词开头，对句中某一成分提问的句子叫特殊疑问句。
  常用的疑问词有：what、who、whose、which、when、where、how、why等。
  特殊疑问句往往是就其中的某一成分，进行提问，而且根据情况直接回答，不能用yes或no简单回答。
  常见的疑问代词有who, whose, which, what；疑问副词有when, where, why, how。
  例：What do you do on Sunday? 你周日的时候干什么？ 
      Which class are you in? 你在哪个班？ 
      Where does Mr. Li live? 李先生住在哪？ 
      Why are you late? 你为什么迟到？

• 特殊疑问句的构成：
  一、 特殊的疑问词。
  特殊疑问句要由疑问代词或疑问副词开头，询问的内容不同, 使用的疑问词也不同。
  我们学过的疑问词有：
  what（询问事物）， how much（询问价格），what time （询问时间，尤其是点钟）， what kind of（询问种类），why（询问原因），who（询问人）， where（询问地点） 等等。如：
  —What is this? 这是什么？
  —It's a key. 这是一把钥匙。
  —How much is it? 这个多少钱？
  —It's twenty dollars. 二十美元。
  —What kind of movies do you like? 你喜欢哪一类型的电影？
  —I like action movies. 我喜欢动作片。
  
  二、特殊的语序。
  特殊疑问句由疑问词开头，其构成是“疑问词 + 一般疑问句”。如：
  What time is it？ 现在几点钟？
  Who is your teacher? 谁是你的老师？
  
  三、特殊的答语。
  特殊疑问句不能用yes, no来回答，而应根据它所询问的内容直接做出回答才行。如：
  — What time is it, please? 请问几点了？
  — It's 7:30. 七点半了。
  — Where are they? 他们在哪儿？