九年级Unit1Topic2知识点

1、九年级Unit1 Topic 2知识点Topic 2 China has the largest population1.重点语法 现在完成时常与下列表不明确的状语连用：1）already 和 yetalready “已经”（多用于肯定陈述句），如： He has already gone home. 他已经回家了。yet “已经; 还”（用于否定句或疑问句），如：Have you found him yet? 你已经找到他了吗？I havent finished my homework yet. 我还没完成作业。 already 也可用于疑问句，表“出乎意料或惊奇” Have you fin

2、ished your homework already? 难道你已经完成作业了？2)ever 和 neverever “曾经”（多用于疑问句，问初次经历），如：I have ever been abroad. 我曾出过国。never“从未；从来不”（多用于否定陈述句），常回答ever的句型。如：I have never seen him before.-Has he ever been abroad? 他曾出过国吗？-No, never. 不，从来不。3)just “刚刚”（多用于肯定句，位于谓语动词之前），如：I have just tried to call you. 我刚刚打电话给你。4

3、)before “之前”（一般位于句末；常与never呼应），如：He says he has never seen such beautiful scenery before. 他说他以前从来没看过这么美的风景。2.get lost “走失”。其中lost 是形容词。3. 给某人打电话最常用：call sb. 不常用：call sb. up /give sb. a ring ring sb. make a phone call to sb 4.完全倒装句。其含义为“A如此，B也如此。”肯定形式：其结构是“so +be/助动词/情态动词+主语”。 Jim is a student, so is

4、 Tom. 吉姆是一名学生，汤姆也是。 Jim likes sports, so does Tom. 吉姆喜欢运动，汤姆也喜欢。Jim can swim, so can Tom. 吉姆会游泳，汤姆也会。 否定形式：其结构是“neither/nor + be/助动词/情态动词+主语”，表示A不怎样B也不怎样e.g. Jim wasnt Chinese, neither/ nor were they.吉姆不中国人，他们也不是。 Jim cant speak Japanese, neither can I .吉姆不会说日语，我也不会。 Jim didnt go there, neither did

5、I .吉姆没去那儿，我也没去。注：前后两句表达的是同一个主体，它指两者对同一事物的看法，则不能倒装，表“A的确如此”。其结构是“so + 主语+ be/助动词/情态动词” eg: Jim is a good student. So he is. 吉姆是一名好学生，的确如此。 Jim swims well. So he does. 吉姆游泳很好，的确如此。5. such a beautiful country “如此美丽的国家” 区别：so: 修饰形容词或是副词原级。 such : 修饰名词。注意：(1)两者有时可以互换：such a nice girl= so nice a girl. (2)

6、名词前如果出现much, many, little, few等表示数量的词时要用so. e.g.: so many people.这么多人。so little water. 这么少的水。6. It seems that + 从句 = seem to do sth.e.g. I seem to have seen him somewhere before.= It seems that I have seen him somewhere before.我好想曾在什么地方见过他。7. population “人口，居民”，为不可数名词常用形容词large, small 表示人口的多少。（1）“人口

7、的多少”：the population of 例如：The population of the city increased by 2%.（2）“ 的人口”：have a population of +数量 例如：India has a population of 1.1 billion.（3）对人口提问的方式Whats the population of? = how large is the population of中国的人口是多少？Whats the population of China? =How large is the population of China?注：人口不能用ma

8、ny/much 修饰， 但是How many people 对多少人提问这样是可以的。How many people are there in China? = Whats the population of China?8. China had the largest population in the world. = China had a larger population than any other country in the world. 这里用比较级结构表示最高级含义。eg. “李好在他班里是最高的。”Li Hao is the tallest student in his

9、class. = Li Hao is taller than any other student in his class. =Li Hao is taller than the other students in his class. 9. 区别：take place 指必然性的“发生”或有计划、安排之内的“举行”。happen 指偶然的、没有预料的“发生“，其结果往往给人带来不幸或麻烦。eg: The meeting will take place next Friday. 会议将在下周五举行。 The accident happened yesterday. 事故发生在昨天。 两者都不用

10、于被动语态。10. increase by “增加了 ”+百分数/倍数 increase to “增加到”+具体数字 increase from to “从增加到” on the increase “正在增加，不断增长。eg: The price of oil increased by 29%.油价涨了29%。 The number of the students in our school has increased to 2530. The population has increased from 1.2 million to 1.8 million. The temperature i

11、s on the increase.温度正在上升。11.second “位居第二的”India is second with 1.1 billion.= India has the second largest population with 1.1 billion.12.It shows that the population in developing countries is larger than that in developed countries.(1) developing country 发展中国家 developed country.发达国家(2) that 代替the p

12、opulation . that通常替代上文中表示物体的可数名词单数或是不可数名词。those 通常替代上文中表示物体的可数名词复数。eg The weather in Beijing is much colder in winter than that in Guangzhou. The students in our school are smaller than those in your school.13.carry out 实行，进行，执行。14. 基数词构成法：以三位数字为单位，从后向前用逗号依次隔开。第一个逗号用thousand,第二个逗号用million,第三个逗号用bill

13、ion.注：dozen, thousand, million, billion 表示具体数字时，不能使用复数形式，如果使用复数形式，则表示不定数目，与of 连用。 Two dozen, five thousand millions of students billions of books.14.分数表达法英文分数表达法：分子为基数词，分母为序数词，先读分子后读分母。当分子大于1时，分母的序数词则变为复数，直接在词尾加“s”。eg: one fourth / a quarter四分之一； three fourths 四分之三； one second 二分之一； two thirds 三分之二

14、注：分数修饰名词作主语，谓语动词要和所修饰的名词保持一致。eg. Two thirds of the students are girls. Three fourths of the meat is left.15.区别 be short of 表 “缺乏”be short for 表“是的缩写”,for short “简称，缩写eg: She is always short of money at the end of every month. 每个月底她总是缺钱。 TV is short for television. TV是television的缩写形式You can call him

15、Bob for short.16.so far “到目前为止，迄今为止”，常与现在完成时连用。 We have learnt over 2000 words so far.17. take measures to to do sth.采取措施做某事18. be known as = be famous as “作为而出名” 以某种身份, 什么样的产地/地方而出名， be known for = be famous for “因而出名 以某种知识、技能、作品或特征、特点(产品)而出名，He is famous for his great inventions. France is famous

16、for his fine food and wine.因为他的伟大发明，他出名了。 法国的美食和酒是出了名的。He is famous as a great inventor. The town is famous as a wine-producing place.他是著名的伟大的发明家。 这个镇是一个出名的产酒镇。17It has worked well in controlling Chinas population. 它在控制人口数量方面取得了显著的功效。 work well in doing sth. 表“在方面很有功效”, eg: Doing eye exercises works

17、 well in protecting our eyesight. 做眼保健操在保护视力方面很有功效。 18.I cant go shopping in big stores unless I travel for a couple of hours.我得花几个小时，才能到大的商场购物。a) unless = if not 表“除非; 如果不”，引导条件状语从句。 eg: I wont go unless I hear from you. = I wont go if I dont hear from you.如果你不通知我，我就不去。 Unless Bill studies hard, hell fail in the exam. 如果比尔不努力, 他不会通过考试的.b) a couple of 表 “几个人或几件事”, eg: a couple of years ago 几年前; a couple of students 几个学生区别：couple 指任何两件同类的东西;如: a couple of watches /five couples of ca