资源简介 (共21张PPT)05专题五 数词1. 构成基数词 构成1-12 one, two, three, four, five, six,seven, eight, nine, ten, eleven,twelve考点一: 基数词——表示数量的词基数词 构成13-19 由个位数加后缀-teen构成。13、 15、 18是thirteen, fifteen, eighteen20-90 由个位数加后缀-ty构成, 20、 30、 40、50是twenty, thirty, forty, fifty; 80是eighty基数词 构成21-99 “整十” - “个位数”。81 eighty-one101-99 … hundred and “两位数”。691 sixhundred and ninety-one基数词 构成1,000及以上的数 从个位起, 每隔三位加一个逗号; 从右往左, 第一个逗号前是thousand(千), 第二个逗号前是million(百万), 第三个逗号前是billion(十亿)。5,893 five thousand, eight hundred andninety-three2. 用法(1)表确指数字时, hundred, thousand, million等一律不加 “s”; 数字不确指时则要加 “s”, 并可接of。two hundred 两百 hundreds of 成百上千(2)整十数词的复数可用来表示人的岁数或年代。in his fifties 在他五十多岁时 in the 1980s 在20世纪80年代(3)可用于表示小数点、 百分数、 倍数、 编号、 年份等。three point one four 3.14 sixty percent 60% four times 四倍 Grade Seven 七年级in 2026(twenty twenty-six) 在2026年(4)表示时刻:①直接读出 “小时+分钟”: seven fifteen 7:15,eleven thirty 11:30。②30分钟以内用 “分钟+past+小时”: ten past ten(10:10); 超过半小时用 “(60-分钟数)+to+(小时+1)” 表示 “几点差几分”: twenty to nine(8:40)。考点二: 序数词——表示顺序的词1. 构成基数词 序数词变化规则 例词1, 2, 3 不规则变化 first, second, third4-19 基数词尾加th 特殊: fifth,eighth,ninth, twelfth基数词 序数词变化规则 例词20-90整十 ty变为tie再加th twenty→twentieth,ninety→ninetieth两位数或多位数(整数除外) 只变个位数(hundred,thousand等 只在词尾加th) twenty-third,hundredth,one hundred andfifty-ninth2. 用法(1)序数词前要加the, 但若有其他限定词, 则无需加。the first day 第一天 my thirteenth birthday 我的13岁生日(2)a/an+序数词: 又一, 再一……。The cake is so delicious that I want a second one. 蛋糕太好吃了, 我想再吃一个。(3)序数词可用于表示分数和日期等。one third 三分之一 two thirds 三分之二 June 7th=June 7 6月7日Ⅰ. 用所给数词的适当形式填空。1. Your rooms are on the (five) floor.2. In the match, she beat others in the (two) round.3. This is his (three) time to go to asummer camp.fifth second third 4. —Is this your (one) visit to China? —No. I came here last summer.5. Please pass me the (eight) book on theleft.6. Three (seven) of the students wearglasses.first eighth sevenths Ⅱ. 单项选择。( B )1. —How often do you go to the self-servicelibrary? —About times a week.A. the third B. three C. thirdB( C )2. There are two students in this highschool.A. thousands of B. thousandsC. thousand( B )3. Tom is always student to get to theclassroom.A. first B. the first C. the threeCB( A )4. —What do you think of the environmenthere, Mr.Wang?—Wonderful! of the land is covered with treesand grass.A. Two fifthsB. Two fifthC. Second fifthsA( C )5. —What delicious fried rice it is!—Thanks. You can have bowl.A. the second B. second C. a secondCⅢ. 看图写话。there be There are three books on the desk. 展开更多...... 收起↑ 资源预览 当前文档不提供在线查看服务,请下载使用!