语法专项训练(五).ppt

语法专项训练(五)数词,英语数词即表示数目多少或顺序先后的词. 数词有两种: 基数词和序数词. 表示数量多少的叫基数词, 表示次序的叫序数词. 注意以下数词的拼写:,one, the first；two, the second；three, the third；four, the fourth；five, the fifth；nine, the ninth；twelve, the twelfth；fifteen, the fifteenth；nineteen, the nineteenth；twenty, the twentieth；twentyone, the twentyfirst；thirty,the thirtieth；forty, the fortieth；eighty, the eightieth；ninetynine, the ninetyninth；etc.,考点一基数词 1基数词的形式 基数词中112是独立单词, 1319的基数词以后缀-teen结尾, 2090八个整十位数数词以后缀-ty结尾. 表示其他两位数词, 十位与个位之间用连字符“-”:,twenty-three, seventy-five, etc. 百位数与十位数之间, 英式英语用and连接, 美式英语一般不用: three hundred and sixty-five days；eight hundred and twenty-two students, etc. 2基数词的用法,3.基数词的复数形式 (1)表示确切数字时, ten, hundred, thousand, million只用单数形式, 不能加-s. (2)dozen(十二), score(二十), head(一头)等表示确切数字时不用复数形式, 但在表示不确切数字时要用复数:,two dozen bottles of beer；dozens of times；four score and six years；scores of students (3)表示“几十”的数词的复数形式可用来表示人的岁数或年代. She died in her forties. This story took place in the 1950s.,考点二 序数词 1序数词的形式,2.序数词的基本用法,考点三 倍数 1倍数既可以表示增加, 也可以表 示减少, 分数也在此列；表示增加、减少时包括基数, 相当于“乘、除”. (1)通常说“增加了X倍”, 不包括基数, 纯增加；若是“增加到X倍”或“是原来的X倍”, 则包括基数.,The machine improves the working conditions and raises efficiency four times. 这种机器改善了工作条件, 提高了4 倍的工作效率.,(2)分数的构成: 基数词序数词； 基数词(分子)大于1时, 序数词(分母)用复数. one third 1/3, one fifth 1/5, one twentieth 1/20, two fifths 2/5, three sevenths 3/7, five ninths 5/9 2倍数比较的表示法,.单句填空 用括号里适当的单词或短语完成下 面的句子 1It took us quite a long time to get to the amusement park.It was _(a three-hours, a three-hour)journey.,a three-hour,解析: 考查“不定冠词基数词连字符单数名词”的用法. 连字符连接的词作定语且其中的名词用单数.,2It is reported that the floods have left about _(two thousand, two thousands) people homeless. 解析: hundred, thousand, million等 前面有具体的数字表达具体的数量 时, 这些词不用复数, 后面不加of；运用复数时, 后面加of则表达“概数”.,two thousand,3Several _(million, millions)people in the world are sending information by e-mail every day.,million,4He has read _(hundred, hundreds) of books in his life. 解析: hundred 前面没有具体数字, 后of 应用复数, 表示“概数”.,hundreds,5_(Two fifth, Two fifths)of the land in that district _ (is, are)covered with trees and grass. 解析: 考查分数表达. 分子大于1时, 分母要加s. 分数表示整体的一部分, 谓语用单数.,Two fifths,is,6He did it _ (one-third time, one-third the time)it took me. 解析: 考查倍数the名词.,one-third the time,7Louise Brown, the _ (worlds test-tube first baby, worlds first test-tube baby)is 70 years old now.,worlds first test-tube baby,8I hear _ (quite a few, quite a little) boys in your school like playing football in their spare time, though others prefer basketball. 解析: 根据后面的“boys”是可数名词, few 修饰可数名词, 故填quite a few.,quite a few,9It is not rare in the _ (90,90 s) that people in their _ (fifty, fifties) are going to university for further education. 解析: 前者指年代, 用“the基数词的复数”；后者指年龄, 用“ones基数词的复数”.,90s,fifties,10She went to the bookstore and bought _(dozens of books, dozen books) 解析: dozen 意为“一打, 十二个”, 与数词连用时要用单数, 与 of 连用时要用复数形式. dozens of 意为“若干, 许许多多”.,dozens of books,.语篇填空 根据括号内的汉语提示用适当的数词完成下面的短文. Have you ever seen 1._(一个) chimpanzee (黑猩猩) in a zoo？If not, better run and see one.Why？Because theyre in danger and there may soon be none left.,a/one,Chimpanzees were once found in 2._ (许多) African countries.But, last week a United Nations report said that they are disappearing from some countries fast. In Senegal, for example,many/a great number of,there are only 3._ (二 百) left.There used to be 4._(几千)Chimpanzees are also in danger in other parts of the world. Chimpanzees are a kind of great ape.There are three other kinds of great ape: gorillas,two hundred,several thousand,gibbons and orangutans, which are all in danger. There are about 5._ (四十万) great apes in the world.“They all face extinction, some soon, others within 6._(五十五年), ”,four hundred thousand,fifty-five years,says Klaus Topers, head of the UN Environment programme. “Over 7._(百分之九十六) of great apes DNA is like ours.If we lose them, we will destroy a part of ourselves, ”says Klaus.,ninety-six percent,Why are chimpanzees in danger and how can we save them？Thats because of humans.We are killing them and destroying the forests where they live.According to the UN report 8._(数千计的) chimpanzees die each year because of humans.,thousands of,Some people kill them for money.But 9._ (三分之二) of them die after humans cut down the forests where they live, which means great apes have no place to live a