資源簡介 (共29張PPT)第六章 數詞【復習要求】1.識記1~100的基數詞和1~100的序數詞的表達方式。2.掌握數詞的用法以及年、月、日和時刻的表示法。3.理解thousands of,millions of的用法。【知識要點】一、基數詞1.基數詞的寫法和讀法:(1)1~20的基數詞是:one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen,twenty。注意:13~19的數字,是在單詞末尾加后綴 teen構成。注意:thirteen,fifteen,eighteen的拼法。(2)10~100 的十位數為:ten,twenty,thirty,forty,fifty,sixty,seventy,eighty,ninety,hundred。注意:twenty,thirty,forty,fifty,eighty的拼法。(3)數字21~29是由十位數20加個位數1~9構成,中間必須有連字符。如:twenty one(21),twenty two(22)。其他的十位數字依此類推,如:thirty three(33),forty five(45),sixty seven(67),seventy two(72),eighty nine(89),ninety six(96)2.hundred,thousand,million等用來表示確切的數目時,這些詞本身不用復數。如:three hundred,five thousand,nine million。而hundreds of,thousands of,millions of 則表示多而不具體,是一個不確切的數目。如:Hundreds of people went to the celebration.幾百人參加了慶祝會。3.表示“幾十多歲”用in+one’s+十位數的復數形式。如:in his thirties在他的三十多歲4.表示“年代”用in+the+數詞復數。如:in the 1850s/in the 1850’s在19世紀50年代二、序數詞1.序數詞第一至第二十的表達:first(1st),second(2nd),third(3rd),fourth(4th),fifth(5th),sixth(6th),seventh(7th),eighth(8th),ninth(9th),tenth(10th),eleventh(11th),twelfth(12th),thirteenth(13th),fourteenth(14th),fifteenth(15th),sixteenth(16th),seventeenth(17th),eighteenth(18th),nineteenth(19th),twentieth(20th)注意:英語序數詞第1~19中,除了first,second,third 有特殊形式外,其余的一般由基數詞加后綴 th構成。2.第20~100的十位數為:twentieth(20th),thirtieth(30th),fortieth(40th),fiftieth(50th),sixtieth(60th),seventieth(70th),eightieth(80th),ninetieth(90th),hundredth(100th)注意:十位數的序數詞的構成方法是:先將十位數的基數詞的詞尾ty中的y變成i,然后加后綴 eth。3.如果是“幾十幾”的數字,十位數字用基數詞,個位數字用序數詞,中間用連字符。序數詞的數字表達形式是由十位數字加上個位數字,再加上個位數字上的最后兩個字母構成。如:twenty first(21st),forty fifth(45th),thirty second(32nd),eighty seventh(87th)4.如果序數詞用作日期或名次,讀時前面要加上定冠詞“the”。如:I’m the first.我是第一名。My birthday is on May 1st.(讀作May the first.)我的生日是五月一日。三、數詞的用法1.分數的表示法基數詞代表分子,序數詞代表分母。分子是1時,分子的基數詞和分母的序數詞都用單數;分子大于1時,分子的基數詞用單數,分母的序數詞用復數,如:1/3:one third;4/5:four fifths2.小數的表示法基數詞+小數點+基數詞(小數點讀成point,小數點以后的數按一個個基數詞讀)。如:1.8:one point eight;2.87:two point eight seven3.百分數的表示法基數詞+per cent(percent)。如:15%:fifteen percent4.年、月、日的表示法2023年10月1日寫作Oct.1(st),2023;讀作October the first,two thousand and twenty three。5.年齡的表示法這個小男孩三歲。This boy is three years old./This is a three year old boy.6.時刻的表示法6:20讀作six twenty/twenty past six;7:50讀作 seven fifty/ten to eight.7.編號的表示法“第二課”讀作Lesson Two/ the second lesson“五號房間”讀作 Room Five/the fifth room8.倍數的表示法(參照形容詞比較級的用法P41)【例題解析】( )1.In this school,classes begin at in the morning. A.half past seven B.thirty sevenC.half to seven D.seven and a half【答案】 A【解析】 “七點半”常用下面兩種方式來表達:half past seven 和seven thirty。( )2.There are about five workers in our factory. A.hundreds B.hundredC.hundreds of D.hundred of【答案】 B【解析】 500應是five hundred,注意hundred后不加“s”。hundreds of是“成百,幾百”的意思,是一個不確切的數字。( )3.May is month of the year. A.five B.the five C.fifth D.the fifth【答案】 D【解析】 五月是一年的第五個月,這里應用序數詞。基數詞是five,序數詞是fifth,序數詞前要加定冠詞“the”。( )4.It was in when he was already in that he went to Yan’an. A.the 1940s;the 40s B.the 1940s;his fortiesC.1940’s;his forties D.the 1940’s;his 40s【答案】 B【解析】 “在20世紀40年代”,前面必須有定冠詞“the”,此外,年代后要加“s”。“某人40多歲”要用“sb.is in one’s forties”.【同步精練】( )1.Shortly after the accident two police were sent to the spot to keep order. A.hundred B.hundredsC.hundreds of D.hundred of【答案】 A【解析】 hundred 前有數詞修飾時不能加“s”,表確數;無數詞修飾時后面要加s,且跟介詞of,即hundreds of,表約數,是“數以百計的”的意思。( )2.Every year watch NBA on TV. A.million people B.millions of peopleC.millions people D.million of people【答案】 B【解析】 同hundred 的用法。millions of 是“數以百萬計的”的意思。( )3.There are days in a year. A.three hundreds sixty fiveB.three hundreds and sixty fiveC.three hundred and sixty fiveD.three hundred and sixty five【答案】 C【解析】 “三百六十五”用英語表達為:three hundred and sixty five。( )4.My brother is in . A.Three Class,One Grade B.Class Three,Grade OneC.Grade One,Class Three D.class three,grade one【答案】 B【解析】“幾年級幾班”在英語中先說班級,再說年級?!耙荒昙壢唷睉獮?Class Three,Grade One。( )5.Please turn to .Let’s read the text aloud. A.Page Two B.the page twoC.second page D.page second【答案】 A【解析】 “第二頁”可以表示為:page two 或 the second page。( )6.—I’m going to see Mr.Smith after school this afternoon.—All right! I’ll wait for you at . A.ten forty B.ten past fourC.half to four D.two ten【答案】 B【解析】 “四點過十分”表示為:ten past four。( )7.He began to work there . A.on his fifty B.at age of fiftyC.when he fifty D.in his fifties【答案】 D【解析】 “在某人幾十歲時”表示為:in one’s+序數詞第20~90的復數形式?!霸谒迨鄽q時”表示為:in his fifties。( )8.The bridge is one hundred . A.meter long B.meter alongC.meters long D.meters along【答案】 C【解析】 one hundred修飾可數名詞的復數,后面再跟表示長、寬或高等的形容詞。( )9.There are months in a year.December is the month of the year. A.twelve;twelve B.twelve;twelfthC.twelfth;twelve D.twelve;twelveth【答案】 B【解析】一年有12個月,用基數詞;而十二月是一年中的第12個月,用序數詞。( )10.Sunday is the day of the week. A.seventh B.first C.second D.third【答案】 B【解析】常識題。星期天是一周的第一天。( )11. of the students are girls in our class. A.Two three B.Two threesC.Two thirds D.Second three【答案】 C【解析】分數的表示法:分子用基數詞,分母用序數詞。若分子大于一,分母要加“s”。( )12.The price of such material was reduced . A.by 18 percent B.to 18 percentC.at 18 percent D.for 18 percent【答案】 A【解析】價格減少或增加多少百分比,介詞要用by。( )13.The Olympic Games are held . A.every four year B.every four yearsC.every three years D.every fourth years【答案】 B【解析】 “每四年”“每隔三年”用英語表達是:every four years/other three years。( )14.The speech is likely to last ,so I’ll be back at 9∶00 p.m.. A.two and a half hour B.two hours and half an hourC.two and a half hours D.two hour and a half【答案】 C【解析】“兩個半小時”可表達為:two and a half hours 或 two hours and a half。( )15.The old fisherman cast the net ,but still caught no fish. A.a third time B.the third timeC.three time D.the third times【答案】 A【解析】 序數詞前加定冠詞表示“第幾”,加不定冠詞表示“又一”“再一”。 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