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中考专题四数词基数词表示人或事物数量多少的词.序数词表示人或事物的顺序的词.一.基数词.
1.基数词的读法.11—12:one twothree fourfive sixseven eightnine teneleven twelve213—19:词尾力口-teen:thirteenfourteen fifteensixteen seventeeneighteen nineteen320,30,40,50,60,70,80,90:逢十词尾加一ty:twenty thirtyforty fiftysixty seventyeighty ninety421——99:在十位与个位之间加连字符构成.21—twenty-one99—ninety-nine5101--999:先说几百,再加and,再加末尾两位数或个位数.101—one hundredand one238two hundredand thirty-eight61000以上的数先将数字从右往左数,每三位数用一个逗号隔开,从右往左第一个逗号表示“千”读thousand第二个逗号表示百万读million第三个逗号表示“十亿”读billion18,657,421ei ghteenmillion,six hundredand fifty-seven thousand,four hundredand twenty-one.二.序数词基数词变序数词口诀基变序,有规律,词尾要加th.一二三,特殊记,词尾分别tddfirst secondthird八去t,九去e,ve要用f替.ty变作tie,再加th莫忘记.若遇几十几,只变个位就可以.三.数词的应用.
1.表编号.结构:名词首字母要大写+基数词=the+序数词+名词Lesson One=the firstlesson注有些编号,一般仅用第一种表达法Room101101号房间.序数词前一般加定冠词the但序数词前与不定冠词a/an连用时,表示“又一,再一”You veclone itthree times.Why nottry fourthtime【./.数词前加eve“,表示每……/每隔…….every tendays=every ninthday每十天每隔九天注:ever+基数词+复数名词=every+序数词T+单数名词
2.基数词的复数形式表示年代和年龄D表示年代in the+年份的复数在几世纪几十年代.在十九世纪七十年代..2表年龄in ones+整十的复数表示在某人几十岁时在他四十岁时./thousand/mi11ion/bi Ilion.若hundred/thousand/million/billion前有基数词时,其后不加s,也不加of.若没有时,既加s也要带of.Every yearvisitors cometo China.There aretwo students in our school.of of.若其前有a few、many、several修饰时,通常用复数,后接of.
1.若名词前有the修饰时,用单数,后接ofTwo thestudentsinourschoolare fromthe countryside.B.hundred ofof.几个半的表达法基数词+and+a half+名词复数=基数词+名词单数/复数+and+a halftwo anda halfhours=two hoursand ahalf.时刻表达法1整点基数词+clock2几点几分A.直接读法先读小时,后读分钟3:25three twenty-fiveB.间接读法a30分钟.分钟+past+小时325twenty-five past threeb30分钟.60-分钟+to+小时数+13:55five to fourc30分钟=half15分钟;a quarter45分钟;three quarters3:30—half pastthree3:15a quarterpastthree3:45a quartertofour.日期表达法结构
1.月日,年日用序数词,年用基数词注:年份的读法先读前两位数,再读后两位数.读日时要加the.1900—nineteen hundred1807eight and seven eighto seven2023two thousandeight2007年3月21日.—March the twenty-first,two thousandand seven.
2.日月年the+序数词+of+月,年2007年3月21日thetwenty-first ofMarch,two thousandandseven.
9.分数词的表达法l.结构a.分子用基数词,分母用序数词.b.当分子大于1时,分母加复数.3/4—three fourthsthree-fourthsm.注意n.分数词的几种特殊形式.1/3—one third=a third1/4—one fourth=a quarter1/2—one second=a half3/4-three fourths=three quarters.分数词作主语时,谓语动词根据分数词后面的名词来确定.Two fifthsof themilk bedrunk byTom.One thirdof thestudents begirls.。