英语语法-数词(完善版).ppt

1.__ofthestudents__boysinClassA.Twothree;areB.Twothirds;areC.Twothirds;is2.__ofhermoney__spentonclothes.A.Twothree;areB.Twothirds;isC.Twothird;is3.__theteachersinourschoolisaboutonehundred,and__ofthemarewomenteachers.A.Thenumberof;twothirdB.Thenumberof;twothirdsC.Anumberof;twothirds5.Theboyalwaysstaystherefor__.A.oneandhalfhourB.oneandahalfhourC.oneandahalfhours6.Theoldmandrank__beer.A.twobottlesandahalfB.twoandahalfbottleC.twobottleandahalf四.数词的表示法—倍数一倍once，两倍twice，三倍threetimes(三倍或以上基数词＋times)Thisboxis5timesasbigasthatone.=Thisboxis5timesthe?size?ofthatone.=Thisboxis4timesbiggerthanthatone.as形原as形比thanthe?size?of△Abe/实义倍数/百分数BI?have?three?times?as?many?as?you.我有你三倍那么多。The?earth?is?49?times?the?size?of?the?moon.地球是月球的49倍。

The?grain?output?is?8?percent?higher?this?year?than?that?of?last?year.

今年比去年粮食产量增加8%。△by+倍数，表示增加多少倍

The?production?of?grain?has?been?increased?by?four?times?this?year.

今年粮食产量增加了4倍。Numerals一、数词的分类构成规律基数词序数词1－12有各自独立的形式。13-19都是相对应3－9加上teen构成，特殊拼写的词有thirteen,fifteen,eighteen。20－90都以-ty结尾，特殊拼写的有twenty,thirty,forty,eighty。21－99,整数十位数＋各位数，中间有“－”。百位数，由百位数＋and+两位数组成。……1－3分别为first,second,third。4－19都是在后面加上th,特殊的有fifth,eighth,ninth,twelfth。20－90把y变成ie然后加th,如twentieth。21－99的序数词变后面的各位数。序数词可以用缩写，如1st,2nd,3rd,4th…一.基数词、序数词基数词序数词基数词序数词onetwelvetwotwentythreetwenty-onefourfortyfiveonehundredsixonehundredandfiveeightonehundredandtwenty-nineninenineteenfirstsecondthirdfourthfifthsixtheighthninthtwelfthtwentiethtwenty-firstfortiethonehundredthonehundredandfifthonehundredandtwenty-ninthnineteenth读法（基数词）百位和十位间用and连接,十位和个位间用-连接threehundredandtwenty-one321右往左数,三位一组,逗号隔开.依次是thousand(千)million(百万)bil