資源簡介 (共19張PPT)Unit 2Amazing Numbers【定義】Numerals 數詞【基數詞】【序數詞】【用法】定義表示數目和順序的詞叫數詞,數詞可分為基數詞和序數詞兩類。1)1-12, 獨立成詞。one two three four five six seven eight nine ten eleven twelve2)13--19, 由3-9 + teen構成。14–fourteen 特殊拼寫: 13– thirteen 15--fifteen 18—eighteen3)20-90, 以-ty結尾。60—sixty 特殊拼寫:20—twenty 30—thirty 40—forty 50—fifty 80—eighty4)21-99 (兩位數) 十位與個位之間有 連詞符“-”。21 twenty-one 55 fifty-five 99 ninety-nine5)百—hundred 千—thousand百萬—million 十億—billion6)101-999, 三位數, 百位與十位/個位之間加and, 十位和個位用“-”連接。101 one hundred and one 841 eight hundred and forty-one基數詞的構成7) 1,000以上數目,從右向左每三位用“,”分開, 分別讀為thousand, million, billion6 , 500 , 431 , 7 29andbillionmillionthousandhundred十位-個位基數詞的讀法基數詞,不難記,找出規律很容易零至十二形各異,一個一個單獨記。后加-teen 為“十幾”thirteen, fifteen看仔細,eighteen只有一個t.表示“幾十”要加-ty, twenty, thirty是例外,forty, fifty 更厲害,和eighty一樣搞例外。表示數字“幾十幾”,連詞符號要切記。若要表示“幾百幾”,and 常把百、十系。還有一點要注意,幾百后別把-s立。基數詞構成規律口訣小試牛刀123 __________________________________________1,234 __________________________________________12,345__________________________________________one hundred and twenty-threeone thousand two hundred and thirty-fourtwelve thousand three hundred and forty-five序數詞的構成1) 1-3, 獨立成詞 first, second, third2) 4-19, 相應基數詞+th, fourth特殊拼寫: fifth, eighth, ninth, twelfth。3) 整十:20-90, y變成ie +th, 如: twentieth4) 21-99, 只把個位的基數詞變成序數詞如: twenty-first5) 序數詞縮寫---數字+最后兩字母如: 1st, 2nd, 3rd ,4th…序數詞構成規律口訣小試牛刀第101__________________________________第80______________________________________第5__________________________________________one hundred and firsteightiethfifth基變序,有規律一、二、三,特殊記,面目全非要注意,加th從4起,八少“t”,九去“e”,“ve”要用“f”替,(five, twelve)見“y”變成“i”和“e”,詞尾加上“th”,(twenty, thirty,…ninety)若是遇到幾十幾,只變個位就可以。序數詞縮寫記清楚,數字后跟兩字母。Atteintion(1)序數詞作定語, 前面要加the; 如果序數詞前已經有物主代詞或名詞所有格時, 不可再加定冠詞the。(2)有時加a/an, “再一”, “又一” 的意思John lives on the fifteenth floor.It’s Monday, and it’s my fifteenth birthday.Is it Lily’s fifteenth birthday, too We’ll have to do it a second time.單位詞編號數詞的用法hundred thousand million billion表示具體數目, hundred, thousand, million不用復數 表示不確定數目, 用復數。hundreds of(數百)thousands of(數千)millions of(數百萬)+ 名詞復數There are three _________( thousand) students in our school.After the war, _________( thousand) of people became homeless.thousandthousands 編號在前,名詞在后,用序數詞,前面有the; 編號在后,名詞在前,用基數詞,注意首字母大寫; 房間號碼和電話號碼要一個一個分別讀。Classroom 312Class Four, Grade SixUnit 9=the ninth unit我家在三單元二棟501室。My house is in_________________________.Room 501, Building 2, Unit 3百分數小數分數percent (百分之……)15%: fifteen percent我們學校百分之四十的學生,每天堅持一個小時的英語閱讀。_________________________________read English books for an hour every day.Forty percent of students in our schoolpoint (點……)小數點前面的數字按基數詞讀,小數點后面的數字一位一位讀。3.1415: three point one four one five701.21seven hundred and one point two one分基母序,分子大于1,分母就要加s。1/2: a half 1/4: a quarter1/3: one third 2/3: two thirds_________ of the students in our class have passed the test.First thirdOne thirdOne threeNumerals特殊數字的表示及讀法分類 表示規則 舉例 讀法小數 基數詞加小數點表示,點讀作point, 小數點后的數字一位一位地讀 3.65 0.365 three point six fivezero point three six five分數 分子用基數詞,分母用序數詞;分子大于1,分母用復數 1/2 1/3 2/3 a / one halfa / one thirdtwo thirds百分數 %讀作percent(per cent) 50% fifty percent次數倍數 一次(倍)once; 兩次(倍)twice; 三次(倍)及以上用:基數詞 + times表示 1000次 a / one thousand times編號 用基數詞表示,基數詞位于名詞后,首字母大寫;用序數詞表示,序數詞位于名詞前,序數詞前有定冠詞the 第一課 302號房 Lesson One / the first lessonRoom 302“幾十”的復數形式基數詞+名詞12 幾十多歲—in + one’s+數詞整十復數 年代—in + the +數詞復數I was born in the nineties / 1990s/1990’s.He founded his company in his forties.合成形容詞作定語,中間有連詞符“-”,當中的名詞用單數。an [8-year-old ] girl a [seven-day] holidayThanks to the policeman, the mother finally found her ____________ son.three-years-oldthree-year oldthree-year-oldNumerals數詞的其他用法一、年月日1. 1949年→ nineteen forty-nine;2020年→ twenty twenty / two thousand twenty2. 2020年9月1號→September 1, 2020 / 1 September, 20203. 在二十世紀三十年代→in the 1930s(讀作in the nineteen thirties)二、年齡1. 具體年齡,直接用基數詞,如:I’m 14. = I’m fourteen years old.2. 大概年齡,用整十復數表示,如:in her forties 在她四十多歲的時候Numerals數詞的其他用法三、時刻1. 整點,“基數詞 + o’clock”, o’clock可省略,如:six o’clock2. 非整點(1)順讀法:即“先時后分”,直接用基數詞讀出,如:9:47→nine forty-seven(2)逆讀法:“先分后時”→分鐘小于或等于30時,用“分鐘數 + past + 鐘點數”形式,如:9:15→a quarter past nine; 9:30→half past nine分鐘大于30分鐘時,用“(60-分鐘數)+ to +(鐘點數+1)”形式,如:9:45→a quarter to tenNumerals數詞的其他用法四、加減乘除1. = 用is, make, equal等詞表示2. + 用plus, and或add表示,如:Two plus three is / makes five.3. - 用minus或take from表示,如:Ten minus six is four.4. × 用times或multiply表示,如:Three times four is twelve.5. ÷ 用divide表示,如:If we divide sixteen by four, we get four.五、單位詞: hundred thousand million billion trillion1. 表示具體數目時,不用復數,如:three hundred2. 但表示概數時,后面要加s,此時不可直接加名詞或代詞,要通過介詞of,如:Hundreds of visitors visited the exhibition this morning.改錯題1.About three-fifth of the workers of that company are young people.A B C D2.439 is four hundreds and thirty-nine.A B C D3.This big factory has one thousand of workers.A B C D4.Hundred of people attended the meeting last night.A B C D5.The nineth floor of the building is our office.A B C D課堂檢測A three-fifth→three fifthsB hundreds→hundredC 去掉ofA Hundred of→Hundreds ofB nineth→ninthII.用所給數詞的正確形式填空1.We are in (二年級八班).2.There are (12)months in a year. December is the (12)one.3.This is my (1)bag.4.Monday is the (2)day of the week.5.I have (3) books. I like my (3)book.6.In the (20世紀90年代),our country had many factories.7. (2/3)of my classmates are girls.8. (70%)of the students played QQ farm games on the Internet in the 2010s.Class Eight Grade Twotwelvetwelfthfirstsecondthree1990s/1990’sTwo thirdsSeventy percentthirdClass over 展開更多...... 收起↑ 資源預覽 縮略圖、資源來源于二一教育資源庫