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1、初中英语语法大全:数词定义: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。I基数词1.基数词的构成(1)1-20one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen,twenty(2)21-99先说“几十”,再说“几”,中间加连字符。23→twenty-th
2、ree,34→thirty-four,45→forty—five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one(3)101—999先说“几百”,再加and,再加末两位数或末位数;586→fivehundredandeighty-six,803→eighthundredandthree(4)l,000以上,先从右往左数,每三位数加一个“,”,第一个“,”前为thousand.第二个“,”前为million,第三个“
3、,”前为billion(美式)或thousand,million(英式),然后一节一节地表示。1,001→onethousandandone9,785→ninethousand,sevenhundredandeighty-five18,423→eighteenthousand,fourhundredandtwenty-three6,260,309→sixmilliontwohundredandsixtythousandthreehundredandnine750,000,000,000→sevenhundreda
4、ndfifty,billion(美式)sevenhundredandfiftythousandmillion(英式)2.基数词的用法(1)作主语 eg.FourOfthemcomefromParis.(2)作宾语eg.一Howmanybookswouldyoulike?一Iwouldliketwo.(3)作表语 eg.Sevenminustwoisfive.(4)作定语eg.Therearethreepeopleinmyfamily•(5)作同位语eg.Youtwowillgoswimmingwithus.(6)
5、表具体数字时,hundred,thousand,million用单数。eg.Therearesixhundredstudentsinourgrade.(7)表不确定的数字时,数词用复数。若带名词,再加of。hundredsof(数百,成百上千的),thousandsof(数干,成千上万的),millionsof(数百万)twothousand(两千)Thousandsandthousandsofpeoplehavevisitedthecity.成千上万的人参观了这座城市。(8)在一些表示“一排”或“一组”的词组里
6、;eg,Theyarrivedintwosandthrees.他们三三两两地来了。(9)表示“…十”的数词的复数可以表示人的岁数或年代。eg.Heisinhisearlythirties.他有三十来岁(31—34岁):Thistookplaceinthe1930s.这事发生在二十世纪三十年代;(10)表示时刻钟点表达法。 顺读法(钟点+分钟) 如:4:30fourthirty4:45fourforty-five 4:15fourfifteen 倒读法(分钟+to/past+钟点) 如:4:30h
7、alfpastfour 4:15fifteenpastfour/aquarterpastfour 4:45fifteentofive/aquartertofive eg.IwatchCCTVNewsatseveno’clockeveryevening.(11)表示百分数百分数的表达方式是:基数词+percent(单数形式)+of+名词。如:Thirtypercentofthestudentsinmyclassarefromcities. 我班30%的学生来自城市。About61percentofthesurf
8、aceiscoveredbywater. 大约61%的表面被水覆盖着。(12)小数的读法:小数点读作"point",小数后各位数要分别读,小数点前的数若为"0"可略去不读。 Examples: 2.468读作:twopointfoursixeight 0.157读作:(zero)pointonefivesevenII序数词1.序数词的构成(1)一般在基数词后加th