中考英语语法之数词.docx

中考英语语法之数词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-three,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“，”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→sevenhundredandfifty,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)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;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-five4:15fourfifteen倒读法(分钟+to/past+钟点)如：4:30halfpastfour4:15fifteenpastfour/aquarterpastfour4:45fifteentofive/aquartertofiveeg.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。About61percentofthesurfaceiscoveredbywater.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：twopointfoursixeightII序数词1.序数词的构成(1)一般在基数词后加theg.four→fourth,thirteen→thirteenth(2)不规则变化one→first,two→second,three→third,five→fifth,eight→eighth,nine→ninth,twelve——twelf