小学英语基数词和序数词知识总结及练习
题
表示数目和顺序的词叫做数词。数词又分基数词和序数词，基数词表示数量，序数词表示顺序（日期、楼层、排名等）。
基数词变序数词口诀：
基变序，有规律，词尾加上th;
一二三，特殊记，词尾字母t,d,d (first,second,third);
八减t(eighth), 九去e(ninth)，f来把ve替(five--fifth,twelve--twelfth); 单词ty作结尾，ty变成tie(twenty-twentieth);
若是碰到几十几，只变个位就可以(twenty-one--twenty-first). 序数词表顺序，一般需用定冠词（the）。
1 one first (1st) 2 two second (2nd) 3 three third (3rd) 4 four fourth (4th ) 5 five fifth (5th ) 6 six sixth (6th ) 7 seven seventh (7th ) 8 eight eighth (8th) 9 nine ninth (9th) 10 ten tenth (10th ) 11 eleven eleventh (11th ) 12 twelve twelfth (12th) 13 thirteen thirteenth (13th ) 15 fifteen fifteenth (15th )
20 twenty twentieth (20th ) 21 twenty-one twenty-first (21st ) 22 twenty-two twenty-second (22nd ) 23 twenty-three twenty-third (23rd ) 30 thirty thirtieth (30th ) 40 forty fortieth (40th ) 50 fifty fiftieth (50th )
基数词和序数词练习
一、写出下列词的序数词
1. one _________ 2. two ___________ 3. six ___________
4. five _________ 5. nine ___________ 6. twelve _________ 7. eight ________ 8. twenty-one ______________
二、写出下列单词的基数词
1. third _______ 2. fourth __________ 3.tenth __________ 4. twentieth _____________ 5. nineteenth _________________ 6. thirty-first ____________
三、根据句子意思填空
1. Children’s Day is on the ______________ of June（六月）. 2. There are __________ months（月）in a year.
3. Teachers’ Day is on the _____________ of September（九月）. 4. Three plus(加) six is _____________.
四、选择填空
( ) 1. My sister’s birthday in 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. There are _______ days in a week. A. the seven B. seventh C. seven ( ) 4.Sunday is the _______ day of a week. A. one B. first C. second ( ) 5. Twenty-eight minus(减)six is ______.
A. the twenty- second B. twenty-two C. twenty- second ( ) 6. Four plus(加)_______ is twelve. A. seven B. eight C. nine
