基数序数[精华]

基数序数[精华] 基数词与序数词专项练习 基数用于示数量多少，而基数词用于表示次序，常在日期中出现。区别:基数词前面没有“the”;序数词前一定要有“the”。 一、知识归纳 ?基数词变序数词的规律: 一、二、三、特殊记(first, second, third)。 八减t,九去e,(如:eighth, ninth), f 来把ve替。(如:twelfth). 单词ty作结尾，ty变成tie(如:twentieth). 若是碰到几十几，只变个位就可以。(如:twenty-first) ?1-100的序数词: 1st--first;2nd--second;3rd--third;4th--fourth;5th--fifth;6th--sixth;7th--seventh;8th--eighth;9th--ninth;10th--tenth;11th--eleventh;12th--twelfth;20th--twentieth;21st--twenty-first;22nd--twenty-second;29th--twenty-ninth;30th--thirtieth;31st--thirty-first;40th--fortieth;50th--fiftieth;60th--sixtieth;70th--seventieth;80th--eightieth;90th--ninetieth;100th—hundredth 2. 序数词的用途 a. 用来表示时间 ，表示年月日: “年”用基数词，“日用序数词”。例如: 例如:2008年2月28日可以表示为February 28th, 2007 th表日期的时候 It’s the 16th of October= It’s October 16。 表示时刻的话，A，直接读写数词。如,9:15 nine fifteen , 10:30 ten thirty , 11:45 eleven forty-five ,7:05 seven o five , 2:25 two twenty-five , 5:55 five fifty-five B，借助past和to来表达。past一般用于30分钟以内(含30分钟)的时间表达;to一般用于超过30分钟的时间表达。一刻钟可以用a quarter表示，半小时可以用half表示。如:9:15 a quarter past nine ， 10:30 half past ten，11:45 a quarter to twelve ，7:05 five past seven ， 5:55 five to six b. 用来表示顺序 例如:He is always the first to come to school. 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 c. 用来表示楼层 例如:He lives on the fourth floor。 以下是表示月份的单词，同学们要牢记: January, February, March, April, May, June, July, August, September, October, November, December, d、表示“加减乘除”: 15+2=, How much is fifteen plus two? 8-7=? How much is eight minus seven? 12×12=,How much is twelve times twelve? 81?9=,How much is eighty-one divided by nine? e、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。 1/2: one-second 3/4 three-fourths, 2/5 two-fifths. f、读小数时，数字只用基数词: 3.4 读作:three point four 0.2读作zero point two g(一百是a hundred 两百是two hundred ，几百是hundreds of 二、巩固练习: A、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 B、 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 C、用英语写出下列算式: 1+1=2 2+5=7 19-12=7 23-17=6 D、用英语写出下列时间: 9:30 1:05 6:40 8:57 4:09 12:00 . 三、选择填空。 ( )1. My cousin’s birthday on the _____ of October. A. three B. first C. the second ( )2. What date is it today? It’s _____ of April. A. twelfth B. the 12th C. 12th ( )3.Sunday is the _____ day of a week. A. one B. first C. second ( )4. —What’s the time, please? —It’s _______. A. nine thirty-five B. forty-eight past six C. fifty-five to four D. thirty-one two ( )5. There are _______ days in a year. A. three hundreds sixty-five B. three hundred and sixty-five C. the third hundred sixty-five D. third hundred and sixty-five ( )6. The computer was cheap. I spent only two _______ yuan on it. A. thousands B. thousand C. thousands of D. thousand of ( )7. —On which floor do you live? —The _______ floor, and my room number is _______. A. fifth; five zero two B. fifth; five zero second C. five; five zero second D. five; five zero two ( )8.In our city _______ people have moved into their new houses. A. thousand B. thousands C. thousands of D. many thousand ( )9. Now children, turn to page _______ and look at the _______ picture in Lesson Two. A. twentieth, one B. twenty, one C. twentieth, first D. twenty, first ( )10. About _______ of the students in our class are League members. A. four-fifths B. four-fifth C. four-fives D. four-fifths