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基数词与序数词【知识梳理】
1、基数词11One20twenty101one hundred and one2two21Twenty-one123one hundredand twenty-one3three30thirty1000one thousand4four40forty1001one thousandand one5five50fifty1023one thousandand twenty-threetwo thousand,two hundredand6six60sixty2235thirty-five7seven70seventy8eight80eighty9nine90ninety10ten100One hundred［注］前面有数词修饰时,用单数形式hundred,thousand,million表示概数hundreds of,thousands of数词与其他词构成复合形容词，其中，名词要用单数形式a two-year-old boy【知识梳理】
2、序数词2第第第第第1〜1020〜901001st first2nd second3rd third20th twentieth4th fourth30th thirtieth40th fortieth50th5th fifthfiftieth60th sixtieth100th hundredth6th sixth70th seventieth80th eightieth7th seventh90th ninetieth8th eighth9th ninth1Oth tenth注序数词前常用定冠词，有时还可以用不定冠词则表示“又一”的意思a/an例如格林先生另外还有一辆车Mr.Green hasa secondcar.他又尝试了一次He hastried asecond time.【知识梳理】
3、数词的应用3年月曰的表示
①年份用基数词，如
1.2000--------two thousand;1905------nineteen0five
②日用序数词，如5月8日，写作May8lh;读作Maythe eighth;分数的表达分子用基数词，分母用序数词，分子大于分母则加
2.1,s如1/3one third;2/3two thirds;1/4one fourth/a quarter;3/4threefourths/three quarters;倍数的表达一倍两倍两倍以上用基数词倍
3.once;twice;+times5-----five times,时间表达法:时间可用顺读法或倒读法两种方式表达，介词要使用例如4at500five oclock或618six eighteeneighteen pastsix或1215twelve fifteenfifteen aquarter pasttwelve或430four thirtyhalf pastfour645six forty-five aquarter toseven注意序数词应注意的几点事项.多位数的基数词变成序数词时,只需将末位基数词变成序数词，前边的基数1词不变如第forty-second42forty-two42nine-hundredth第90nine-hundred900必须在数字后加上序数词的最后两个字母当序数词用阿拉伯数字表示时,
2.如第第21st2132nd32编了号的事物要用基数词表示顺序，但是基数词要后
3.例如第一课第三十二页Lesson OnePage32第房间第路公共汽车305Room30512Bas No.12置序数词前一般要用定冠词如果序数词前用或时二则表示“又一；再一”（没
4.the,a an有具体范围的限制）如尽管Though hehad failedtwice,he wanted to trya thirdtime.他已失败了两次，他还想再试一次The littlemonkey hadhad threeapples,and hewantedtoeat afourth one.那只小猴子已经吃了个苹果，他还想再吃一个3时间表达注意表示整点时间，直接用基数词表达，后边可接，（也可不加）表达“几
1.clock点几分”时，绝不能用oclock表达分”或分”时,常用（刻）
2.“15“45quarter在倒读法中，如果钟点不过半，须用“分钟数钟点数”的形式；如果钟点过半，
3.+past+则用“差多少分钟数全钟点（下个钟点数）”的形式+to+【课堂练习】写出下列的基数词与序数词L基数基数词序数词序数词序数词词1one112two12313304four144051550fifty6six16607seven1770seventy81880eighty9nine1990ninety10ten20100eleventh twelve-twelfth thirteen-thirteenth fourteenthfifteenth sixteenthseve999999nteen-seventeenth.eighteenth,nineteen-nineteenth,twentieth,thirty-thirtieth,forty-fortieth,sixty-sixtieth,seventieth,eightieth,ninetieth写出下列数字的英文写法IL12142040—90194006003578305678key:twelve fourteentwenty fortyninety nineteenfour hundredsix hundredthirty-fiveseventy-eight threehundredandfive.日期的表达法.six hundredand seventy-eight in例:5月1日一May Ist读作May thefirst读作—19月10日_____________________读作—23月8日一______________________读作—月31读作:1Sep.10th Septemberthe tenth读作2March8th Marchthe eighth读作:3Jan.3nd Januarythe third3日______________用英语表示下列时间IV10:058:3012:101:155:479:233:5111:496:007:22key:ten fivehalf pasteight twelveten onefifteen fiveforty-sevennine twenty-three nineto foureleven totwelve sixseven twenty-twoV.Choose thebest answer.、1What timeis itnow Itsin themorning.A.ten pasttwelve B.half pasttwo C.five toten、2We arehaving.A.the FourLesson B.the fourthlesson C.LessonFourth、3My birthdayis onChildrens Day.Its onthe.A.first ofJune B.June first C.tenth ofSeptember、4There arepeople inthe hall.A.three hundredsB.three hundredsof C.threehundred、5Sandy isyears old.Today ishis birthday.A.five...five B.five...fifth C.fifth...five
6.of studentsin ourclass livein school.A.Two fifthB.Second fiveC.Two fifths
7.Sunday isthe dayof theweek.A.seventh B.firstC.second
8.There aremonths ina year.December isthe monthof theyear.。
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