初中英语数词讲解和练习.pptx

1、数词,英语中的数词可分为基数词和序数词两大类。 基数词：人或事物的数目 序数词：数目的顺序。,基数词,序数词,略数,年代,数词,1.基数词,巧记基数词口诀 1至12分别记 13至19都带-teen 13，17 整十后面要用-ty 40，,90 几十几用连字符 53，32 百位以上and连 263,fifty-three ,thirty-two,two hundred and sixty-two,注意：,英语中没有“万”和“亿” 这两个数量单位，要按十进位法来推算。 一万：ten thousand 十万：one hundred thousand 百万：one million 千万： 一亿： 十亿

2、：,ten million,one hundred million,one billion,英语数量单位,one 个 ten 十 hundrend 百 thousand 千 million 百万 billion 十亿,2.序数词,基数词序数词： onefirst twosecond threethird 大部分基数词都在后面加th 注意：fivefifth nineninth twelvetwelfth,注意：,整十的基数词（10除外），均将y变成ie，再加th：twentytwentieth fifty fiftieth 表示二十以上的基数词只变个位数（整十除外）：thirty-onethr

3、ity-first,3.略数表达法,1. 当hundred，thousand，million，billion，dozen等前面有具体的数词时，后面既不能加s，也不能加介词of。 Our school bought two thousand books this year. 我们学校今年买了两千本书,2. hundred，thousand，million，billion，dozen等前面没有具体的数词，则在其后加s和介词of，表不确定的数量或形容数量之多 hundreds of 成百的，好几百 thousands of 数以千计的 millions of 数百万的 There is only h

4、undreds of students 我们学校只有几百个学生 t,three hundred students 三百个学生 two thousand books 两千本书 hundreds of students 三百个学生 thousands of books 两千本书,几百万个人 两百个苹果 三千个箱子 几千个杯子 三百万棵树,There are _（两千）students in our school. The Great Wall is made of_stones. 长城是由数百万石头砌成的,two thousand,millions of,注意：,若表示特定的数目，可在hundre

5、d、thousand后加of There are seven hundred students in this school. Three hundred of them are girls. 该校有700名学生，其中女生有300名。 长乐有六百万人，其中400万是男性。,Changle has six million people.Four hundred of them are men.,4.年代表达法,在20世纪90年代： in the 1990s或in the 1990s 具体年份：in + 年份 in 1994,把基数词改为序数词。 one twelve two fourteen t

6、hree twenty five twenty-one eight forty-four nine ninety-six,first,second,third,fifth,eighth,ninth,twelfth,fourteenth,twentieth,twenty-first,forty-fourth,ninety-sixth,22. January is _ month of the year. A. one B. the one C. first D. the first 23. There are _ days in a year. A. three hundreds sixty-f

7、ive B. three hundred and sixty-five C. the third hundred sixty-five D. third hundred and sixty-five 24. The computer was cheap. I spent only two _ yuan on it. A. thousands B. thousand C. thousands of D. thousand of,25. Please look at the following four pictures and write a _ story about them. A. one

8、-hundred-word B. one-hundred-words C. one-hundreds-word D. one-hundreds-words,two-thousand-student 两千个学生,26. 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 27. In our city people have moved into their new houses. A. thousand B. thousands C. thousands of D. many thousand,28. Now , turn to page _ and look at the _ picture in Lesson Two. A. twentieth, one B. twenty, one C. twentieth, first D. twenty, first 29. _ girls took part in the Super Girl Competi