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1、基数词和序数词一．表示数目多少的词叫基数词：100以下的基本基数词100以上1-1011-1920-90100a/onehundred;1000a/onethousand;1,000,000a/onemillion;1,000,000,000a/onebillion（美）a/onethousandmillion(英)1one11eleven20twenty2two12twelve30thirty3three13thirteen40forty4four14fourteen50fifty5five15fifteen60sixty6six16sixteen70
2、seventy7seven17seventeen80eighty8eight18eightteen90ninety9nine19nineteen10ten二．表示顺序的数次叫序数词：基本序数词的构成1stfirst11theleventh20thtwentieth30ththirtieth2ndsecond12thtwelfth21sttwenty-first40thfortieth3rdthird13ththirteenth22ndtwenty-second50thfiftieth4thfourth14thfourteenth23rdtwenty-th
3、ird60thsixtieth5thfifth15thfifteenth24thtwenty-fourth70thsevenyieth6thsixth16thsixteenth25thtwenty-fifth80theightieth7thseventh17thseventeenth26thtwenty-sixth90thninetieth8theighth18theighteenth27thtwenty-seventh100thonehundredth9thninth19thnineteenth28thtwenty-eighty1,000thoneth
4、ousangth10thtenth29thtwenty-ninth1,,000,000thonemillionth100,000,000thonebillionth注意：Hundredthousandmillion1.其前有具体数字时，用单数：Therearethousandstudentsinthisinthisschool.这所学校大约有2000名学生。2.前无数词，模糊数字+s+of短语:Hundredsofpeoplecometoseeourplay.It’ssogreat.成百的人来看我们的戏剧，它太成功了。3.基数词变序数词口诀：基变序，很容
5、易，结尾加上th。一二三特殊记，结尾各是t,d,d。八去t,九去e,f来把ve替，y改为ie,结尾仍有th。若是遇到几十几，只变个位就可以。一．基数词的用法：1.基数词在句中可用作主语、宾语、表语、定语和同位语。主语：Fourofthemwenttothefactory.他们四个人去了工厂。宾语：Iwanttwo.我要两个。定语：Therethirtyclassroomsinourschool.我们学校有30个教室。表语：Myclassmateiseighteen.我的同学18岁。Heisonlythree,andhecan’tdresshimself.
6、他只有三岁，不会穿衣服。同位语：Wethreewillgotheretogether.我们3个一起去。注意：1以上的基数词作定语时，它所修饰的名词要用复数形式：Theroadis16metersinwidth.这条路十六米宽。18Americanstudentscametoourschoolyesterday.昨天有18个美国学生来到我校。四．序数词的用法：1.序数词可以在句子中当主语、宾语、定语、表语。主语：ThesecondiswhatIreallyneed.第二个是是我真正需要的。宾语：Hechosethesecond.他选了第二个。定语：Wear
7、ecarryoutthefirstplan.我们将执行第一个计划。表语：Sheisthesecondinourclass.在我们班她是第二名。注意：1.TheninestudentsareinClassFive.这九个学生都是五班的。2.TheninthstudentisinClassFive.第九个学生是五班的。3.序数词前用不定冠词的常见情况：①序数词前加“a”表“再一次”。MayIhaveasecondtry?我能再试一次吗？Nowtellmewhyyoutookasecondarrow.告诉我，为什么你手里拿着另一支箭？②在名次中排“第几”You
8、shouldtrytogetafirstorasecondintheexamin
