初中英语专项练习：数词、数词

1、数词定义：表示“多少”和“第几”的词，叫数词。其用法相当于名词或者形容词。数词分为基数词和序数词。一 基数词的表示方法：表示数目的词是基数词。1 最基本的数词 2 基数词112是独立单词，需逐个记忆。基数词1319是在个位数词的词干后加teen构成。其中thirteen,fifteen,eighteen 变化不规则。基数词2090是在十位数词后面加ty构成。基数词2199是在十位数词后面加上个位数词构成，中间加上连字符“-”。twenty-one3 三位数以上的基数词，在百位和十位之间，一般要用连词“ and”。one thousand three hundred and forty-two4

2、 英语中没有“万”和“亿”，在表示“万”和“亿”时，要按十进位发来推算。5 hundred,thousand,millon,dosen这些词前面如有表示具体数字的词，它们不能加“s”，反之则须加“s”.three hundred people二 基数词的用法1 从句子成分上分析，基数词在句中可用作主语，宾语，表语等。four of them went to the factory.i want two .my classmate is eighteen.2 编号的事物用基数词。today we are going to study lesson one.3 表示“年，月，日”时年份用基数词，日

3、期用序数词，其顺序由小到大。 the accident happened in 2006.4 表示“几点钟，几点过几分”用基数词。 its two oclock.5 用于加减乘除的数字用基数词。 one plus one is two.6 表示大几倍或者小多少用基数词。7 表示百分数用基数词。thirty percent of them is water.8 表示分数时，分子用基数词，但分母要用序数词；若分子大于1，分母上的序数词要用复数形式。two-fifths of the books are mine.9 表示带有小数的词用基数词。小数点前的整数按基数词的规则表示，小数点写 ，小数点后的

4、数字应按其数字直接表示出来。10 数词+名词（+形容词）作定语，名词用单数形式。 a 21-year-old girl11 两组与数词有关的介词短语：(1) in +定冠词+数词的复数形式，表示年代in the 1870s/1870s(2) in +物主代词+数词的复数形式，表示某人的年龄 in ones thirties三 序数词的表示方法及其用法1 序数词是表示数目顺序的词2 序数词一十九除第一，第二，第三，第五，第八，第九，第十二变化不规则外，其余均在基数词后加上-th3 整十数词的序数词的构成方法是将整十位数字尾y变成 i再加-eth4 几十几的序数词，只要把个位数变成序数词，十位数不

5、变。5 序数词主要用作定语，表语，前面要加定冠词the .the fifth lesson is very easy to learn.练习1. in our city, _ middle school students want to work as a teacher in the future.a. thousand b.thousand of c.thousands of d.two thousand of2. come and see me in _.a. two or three days b.two or three days time c.two or three daysti

6、me3. qinghai tibet railway completed last year. it is the _ railway that connests tibet with the dther parts of china.a. first b.second c.third d.fourth4. during the holidays,_ people came to visit the beautiful city.a. thousand b.several thousands c.thousands of d.ten thousand of5. the accident hap

7、pened on _.a.nine day of march b.the nine day of march c.nine days of march d. the ninth of march6.although i failed four times, my father encouraged me to have a _ try. a.second b.third c.fourth d.fifth7.what number should appear next after eighty-one?its _. 3 9 27 81a.two hundred and forty-nine b.

8、two hundred and forty-one c.two hundred and forty-eight d.two hundred and forty-three8.it took me _ to find th ekey to the drawer. a.one and half hours b.one and a half hoursc.one and a half hour d.one and half hour9. _, coca-cola began to enter chinas market. a. in 1970s b. in 1970s c. in the 1970s

9、 d. in the 1970s10.we all like the boy _.a.of ten years old b.ten-year-old c.at ten old d. of age of ten11.tom was _ to get to school and i was _.a.first,ninth b.a first, a ninth c. the first ,the ninth d.the second ,the nineth12.every day he begains to do his homework_. a.at ten past seven b.at sev

10、en past ten c.on ten past seventhd.until ten13.we are sure the _ century will bring us more hopes.a.twentieth-first b.twentieth-one c.twenty-one d.twenty-first14.now let me have _.a.the third b.a third try c.third try d.this third try15.at the age of _,he had his own lab.a.thirty b.thirtieth c.the thirtieth d.the thirty16._ are in the army.a.two their sonsb.their two sonsc.their sons two d.two sons their17.my sister is a stude