高中英语语法专练-数词.doc

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1、第四章数词表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。　一、基数词　　1）基数词写法和读法：345　threehundredandforty-five；　　2）基数词一般是单数形式，但下列情况，常用复数：　　a.与of短语连用，表示概数，不能与具体数目连用，如scoresofpeople指许多人；　　b.　在一些表示"一排"或"一组"的词组里；　如：Theyarrivedintwosandthrees.　他们三三两两的到达了。　　c.表示"几十岁"；　

2、　d.表示"年代"，用in+the+数词复数；　　e.在乘法运算的一种表示法里，如：3x5=15Threefivesis(are)fifteen.　二、序数词　　序数词的缩写形式：first---1st　second---2nd　thirty-first---31st　　三、数词的用法　　1）倍数表示法　　a.主语+谓语+倍数（或分数）+as+adj.+as　　　Ihavethreetimesasmanyasyou.　我有你三倍那么多。　　b.主语+谓语+倍数（分数）+thesize(amount，length…)o

3、f…　　　Theearthis49timesthesizeofthemoon.　地球是月球的49倍。　　c.主语+谓语+倍数（分数）+形容词（副词）比较级+than…　　Thegrainoutputis8percenthigherthisyearthanthatoflastyear.　　今年比去年粮食产量增加8%。　　d.还可以用by+倍数，表示增加多少倍　　Theproductionofgrainhasbeenincreasedbyfourtimesthisyear.　　今年粮食产量增加了4倍。　　2）分数表示法　

4、　构成：基数词代表分子，序数词代表分母。分子大于1时，分子的序数词用单数，分母序数词用复数：　1/3one-third；3/37threeandthree-sevenths.数词()1.Inthisschool,classesbeginat_____inthemorning.A.halfpastsevenB.thirtysevenC.halfoversevenD.sevenandahalf()2.Mayis_____monthoftheyear.A.fiveB.thefiveC.fifthD.thefifth()3.

5、InAsia_____werehuntedandkilledduringthepastfiftyyears.A.ninetigersintenB.ninetigersoftenC.ninthtigerintenD.ninetigersintenth()4.TheWinterOlympicsareheld_____.A.everyfouryearB.everyfourthyearC.everyfourthyearsD.everyfouryears()5.BeforetheCivilwar,_____wereforced

6、toworkonthefarmsintheSouthernStates.A.tenthousandofslavesB.tenofthousandsofslavesC.tenthousandsofslaves.D.tensofthousandsofslaves()6.Thelectureislikelytolast____,soI’llbebackat9:00pm.A.oneandahalfanhourB.anhourandahalfC.anhourandhalfanhourD.halfandanhour()7.Mrs

7、.Greenisalreadyin_____,butshestillstudieslawatacollege.A.herfifty’sB.hisfiftiesC.thefiftyD.herfifties()8._____oftheearth_____madeupofoceans.A.Two-third,isB.Two-thirds,isC.Two-third,areD.Two-thirds,are()9.Since1964,_____satelliteshavebeenputintospace.A.dozensofB

8、.fourdozensC.dozenofD.severaldozens()10.TheChinesehavebeenmakingpaperforover_____years.A.twothousandB.twothousandsofC.twothousandofD.twothousands()11.Theoldfishermancastthen