数词专项练习.doc

数词专项表示“多少”和“第几”的词，叫数词。数词分为基数词和序数词两种。基数词1)基数词：在十位数词和个位数词中间加上连字符 “ - “ 。如： 21 twenty -one基数词三位以上的数词， 在百位和十位之间，一般要用连词and “。 如： 132 one hundred and thirty-two.表示”万“的词英语中没有。如1万可用10千来表示。 ten thousand. 30万可用 three hundred thousand 来表示。基数词的用法：一、表示事物的编号：如：the ninth part = part nine 第九部分the Fourth Lesson = Lesson Four 第四课 the sixth paragraph= paragraph six 第六段二、表示年月日： “年”用基数词，“日用序数词”。例如：1949年10月1日写法： Oct.1， 1949. 读做：Oct. (the ) first， nineteen forty-nine.2009年3月28日写法： March 27， 2009. 读作： March， (the) twenty-seventh， two thousand and nine.三、表示 “几点钟， 几点过几分” 用基数词。It is two to two. 现在是两点差两分。四、表示“加减乘除”：15+2=？ How much is fifteen plus two？ 8-7=？ How much is eight minus seven？1212=？How much is twelve times twelve？ 819=？How much is eighty-one divided by nine？One plus two is three.一加二等于三。Eight minus four is four. 八减四等于四。Two times two is four.二乘二等于四.Ten divided by two is five.十除二等于五。五、用数词表示分数时， 分子用基数词，分母用序数词；如果分子大于1，分母要用复数。One-fifth of the books are mine. 三分之一的书是我的。Three-tenths of water is disappeared. 十分之三的水不见了。1/2： one-second 3/4 three-fourths2/5 two-fifths.记口诀：分子基，分母序。分子大于1，分母加 s.六、读小数时，数字只用基数词：3.4读作：three point four0.2读作zero point two七、表示百分数用基数词.Thirty percent of them is water. 它们当中有30%的水。序数词1)序数词：表示数目顺序的词用序数词。用途a. 用来表示时间例如：2008年2月28日可以表示为February 28th，2007b. 用来表示顺序例如：He is always the first to come to school.他总是第一个来学校。c. 用来表示楼层例如：He lives on the fourth floor.他住在四楼。1.序数词119 除第一，第二，第三，第五，第八，第九， 第十二变化不规则外， 其余均由在基数词后加上 -th。2.十位整数的序数词的构成方法是， 是将十位整数基数词的词尾 -y 变成 i 再加 eth3.几十几的序数词，只是把个位数变成序数词， 十位数不变。4.第一百以上的多位序数词 由基数词的形式变结尾部分为序数词形式来表示。one hundred and twenty-first ，one thousand，three hundred and twentieth5.通常前面要加定冠词 the；但是如果序数词前出现不定冠词a或an时，则表示“再”，“又”.Weve tried it three timesMust we try it a fourth time？6.基数词也可以表示顺序。只需将基数词放在它所修饰的名词之后(名词需大写) 即可，不需要添加定冠词。the first lesson-Lesson One ，the fifth page-Page 5， the twenty-first room-Room 211 基数词变序数词的规律 ：基变序，有规律。一、二、三、特殊记，词尾字母t，d，d.(first， second， third)。八减t，九去e，（eighth， ninth）， f 来把ve替。 （twelfth）。单词ty作结尾，ty变成tie(twentieth)。若是碰到几十几，只变个位就可以。（twenty-first）序数词1st first 2nd second3rd third 4th fourth5th fifth6th sixth7th seventh8th eighth9th ninth10th tenth11th eleventh12th twelfth20th twentieth21st twenty-first22nd twenty-second29th twenty-ninth30th thirtieth31st thirty-first40th fortieth50th fiftieth60th sixtieth70th seventieth80th eightieth90th ninetieth100th hundredth小练笔4（数词练习）一、用英语写出下列日期：1月6日 八月七日 5月1日 4月3日 12月1日 10月1日 九月十日 2月4日二、 用英语写出下列数字：1/2 1/3 3/4 2/5 4/7 42.7 5.3 6.37 8.96三、用英语写出下列算式：1+1=2 2+5=7 19-12=7 23-17=6四、用英语写出下列时间：9：30 1：05 6：40 8：57 4：09 12：001. Ive read _ sports news about the F1 race today.A. two B. pieces C. two pieces D. two pieces of2. During World War II， a Jewish（犹太）lady was protected by a local family in Shanghai in her _.A. fifties B. fifty C. fiftieth D. the fiftieth3. The river through our city， which is about _， is clean again.A. 6000 meters long B. 6000-metres-longC. 6000-metre-long D. 6000 meter long4. I study in Yu Cai Middle School. There are two _students in our school.A. thousand B. thousands C. thousand of D. thousands of5. They said they would have holiday.A. a two-month B. two months C. two-months D. two-months6.-When was the PLA founded？-It was founded on _.A. July 1. 1921 B. October 1.1949C. May 1.1922 D. August 1.19277. In the past two years， many tall buildings have been built in our city. The tallest is an that stands in the centre.A. 80-floor building B. 60-floor buildingC. 80-floor buildings D. 70 floors building8.The number of people invited _ fifty， but a number of them _absent for different reasons.A. were ； was B. was ； was C. was ； were D. were ； were9.- How soo