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1、 數(shù)詞:表示數(shù)目或順序的詞 數(shù) 詞基數(shù)詞:用來表示具體數(shù)目序數(shù)詞:用來表示順序 基數(shù)詞的構(gòu)成1至1 2獨立詞, 1 3 -1 9 teen加起2 0 -9 0 整十位的數(shù) -ty結(jié)尾幾十幾,連字符“-”莫忘記。幾百幾,hundred后面and立.你能拼寫百,千,百萬,十億嗎?注意:當(dāng)hundred,thousand,million,billion前面有基數(shù)詞,表示具體數(shù)目的時候,不能用復(fù)數(shù)。如:2 0 0 0人:two thousand people如果他們用來表示概數(shù)(不確定的數(shù)),用復(fù)數(shù)形式,并后加of. 如:數(shù)百萬的學(xué)生:millions of students 典型例詞考查 3 _ 5
2、 _8 _9 _ 1 1 _1 2 _1 3 _ 1 5 _ 2 0 _3 0 _ 4 7 _ 3 1 5 _ 2 0 0 0 _three five eight nineeleven twelve thirtee n fifteentwenty thirty forty - seventhree hundred and fifteentwo thousand 你能讀出四位及以上的數(shù)字嗎?四位和四位以上的數(shù)字的讀寫:先從后往前數(shù),每三位用一逗號隔開分為一段,從右往左,第一個逗號為thousand,第二個逗號為million,第三個逗號為billion。如:2 ,6 4 8 two thousa
3、nd six hundred and forty-eight1 6 ,2 5 0 ,0 6 4 sixteen million two hundred and fifty thousand sixty-four5 ,2 3 7 ,1 6 6 ,2 3 4 five billion,two hundred and thirty-seven million, 基數(shù)詞的用法1 .表示順序、編號 一般置于名詞后,名詞大寫如:Unit 2第二單元; Page2 0 第2 0頁如果數(shù)詞前有No.,則“No.+基數(shù)詞”置于名詞前?!纠洹縒hos that in Picture 1 ? 圖1中的人是誰?He
4、 is a student in No. 9 Middle School. 他是第九中學(xué)的一名學(xué)生。 2 .表示時刻:英語中的時刻是用基數(shù)詞來表示的,最常見的形式有兩種:直讀法。如:6 :3 0 six thirty,7 :5 2 seven fifty-two介詞表示法:先分鐘,后點鐘。表示“分鐘數(shù)不超半小時”,用“分鐘數(shù) + past + 鐘點數(shù)”表示 如:5 :2 5 twenty-five past five。表示“分鐘數(shù)超過半小時”,用“(6 0 -分鐘數(shù))+to+下一個鐘點數(shù)”表示,即“差幾分到幾點”。如:1 0 :4 3 seventeen to eleven。表示“整點鐘 直接
5、用“鐘點數(shù) (+oclock)”表示。 “半點鐘”用half表示,“一刻鐘”用a quarter表示。 如:6 :0 0 six(oclock) 1 0 :3 0 half past ten, 4 :4 5 a quarter to five, 7 :1 5 a quarter past seven。 2 . Can you tell me the time?I do believe you can do it .3:0 0 4:1 55:3 06:4 58:2 31 1:5 7 three oclocka quarter past fourhalf past fivea quarter to
6、 seven twenty- three past eightthree to twelve 3 .基數(shù)詞可以和名詞一起構(gòu)成復(fù)合形容 注意:名詞用單數(shù)形式,各部分間用連字符“-” an eight-year-old boy 一個三天的假期 a three-day holiday4 .表示“在某人幾十多歲時”,用整十的復(fù)數(shù)in his seventies 在他七十多歲的時候在她四十多歲時 in her forties5 .表示百分?jǐn)?shù):數(shù)詞+percent 百分之2 5 twenty-five percent 6 .表示小數(shù)1 .7 5 one point seven five 序數(shù)詞的構(gòu)成規(guī)律:
7、基變序,有規(guī)律,詞尾加上th。一二三特殊記,詞尾字母t,d,d。八去t,九去e,ve 要用f替。ty變y為ie,后面再加th若是遇到幾十幾,只變各位就可以。 Can you spell these words? one _ eight_ nine_ twelve_ two_ twenty _ three _ thirty-seven_five_ fifty_ 序數(shù)詞的用法1 .表示事物的編號,放在名詞前the tenth lesson = Lesson Ten2 .表示具體日期September the first 九月一日3 .表示世紀(jì):in the 2 0 0 0 sIn the 2 1
8、st century 在2 1世紀(jì) 5、分?jǐn)?shù)的表達分子用基數(shù)詞, 分母用序數(shù)詞。分子超過一, 分母末尾加s。1 /3 one third2 /5 two fifths4 /7 four sevenths4 .序數(shù)詞前要加the ,但是當(dāng)序數(shù)詞前已經(jīng)有my ,his ,her 等詞時,不加the。The first day of a week is Sunday.This is my first day in my new school .注意:不定冠詞a/an+序數(shù)詞,表示“再一,又一”We have tired it three times . W e will try it a fourt
9、h time. 課堂檢測 There are _(五百)students in our school He is the _(one)teacher to come to school His mother will have a birthday party on his _(二十)birthday(三分之二)_of the students have lunch at school The river is about _(四十)meters wide We will have a _(三天)holiday He begun to learn English _(在他三十多歲時) Look! (數(shù)千)_people are dancing. five hundredfirst twentiethtwo thirdsfortythree-day in his thirtiesthousands of Homework 1 .Learn the numbers by heart. 2 . Do the exercises on Page 1 8 .