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1、英之翼英语中心专项复习资料专题四数词表示数目多少或顺序先后的词叫做数词。数词分为基数词和序数词,基数词表示数目或数量的多少;序数词表示顺序和等级。一、基数词基本基数词共31个,其中100以下的27个,100及以上的共4个:100以下的基本基数词100及以上的基本基数词1~1011~192-~901one2two3three4four5five6six7seven8eight9nine10ten11eleven12twelve13thirteen14fourteen15fifteen16sixteen17seventeen18eighte
2、en19nineteen20twenty30thirty40forty50fifty60sixty70seventy80eighty90ninety100a/onehundred1,000a/onethousand1,000,000a/onemillion1,000,000,000a/onebillion十亿a/onethousandmillion英语中“万”用“十个千”表示,如fortythousand;“亿”用“一百个百万”表示,如twohundredmillion。读音时注意百位和十位之间要加“and”。如134,056,486应
3、读作onehundredandthirtyfourmillion,fifty-sixthousand,fourhundredandeightysix;104读作onehundredandfour。二、序数词序数词除了first,second,third有独特的形式外,其他的都是在基数词词尾加-th构成。序数词的构成1stfirst2ndsecond3rdthird4thfourth5thfifth6thsixth7thseventh8theighth9thninth10thtenth11theleventh12thtwelfth13th
4、thirteenth14thfourteenth15thfifteenth16thsixteenth17thseventeenth18theighteenth19thnineteenth20thtwentieth21sttwenty-first22ndtwenty-second23rdtwenty-third24thtwenty-fourth25thtwenty-fifth26thtwenty-sixth27thtwenty-seventh28thtwenty-eighth29thtwenty-ninth30ththirtieth40t
5、hfortieth50thfiftieth60thsixtieth70thseventieth80theightieth90thninetieth100thonehundredth1,000thonethousandth1,000,000thonemillionth1,000,000,000thonebillionth三、数词的句法功能主语:Threefromeightleavesfive.八减去三得五。Thesecondwasatallman.第二个人是个高个男子。表语:Mytelephonenumberis8899174.我的电话号
6、码是8899174。Iamthesecondtoinviteyou.我是第二个邀请你的。宾语:Youcantakeasmanyasyouwant,butleavemetwo.你想拿走多少就拿走多少,但给我留下两个。Doyoupreferthefirstorthesecond?第一个和第二个你更喜欢哪一个呢?定语:Westillhaveonehourleft.我们还剩一个小时的时间。Januaryisthefirstmonthoftheyear.一月是一年中的第一个月。注意:1.在使用序数词是,通常前面要加定冠词the,如果序数词前面出现
7、不定冠词a或an则表示“再一,又一”。如:We’llgooveritasecondtime.我们得再检查第二遍。We’vetrieditthreetimes.Mustwetryitafourthtime?我们已经试过三遍了,还必须在试一次(第四次)吗?2.将基数词放在所修饰名词之后,基数词也可以表示顺序,如:thefirstlesson—Lessonone;thefifthpage—Page5;thetwenty-firstroom—Room21四、数词的应用1、分数、小数、百分数分数:分子用基数词,分母用序数词,分子是1以上的数时序数
8、词要用复数形式。整数与分数之间用and连接。1/2onehalf,ahalf(不读作onesecond)1/3onethird或athird2/3twothirds3/4threequarters或thre