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1.基数词、序数词和分数词的构成及基本用法。2.数词作主语时的主谓一致。数词主要包括基数词、序数词和分数词。基数词是表示数目多少的数词，序数词是表示先后顺序的数词。分数词由基数词和序数词构成。一、基数词1.hundred,thousand,million,billion,dozen,score等前有具体数字或several,afew等修饰时，一般不用复数；在表示不确切数目时，可用复数。如：Severalmillionpeopleintheworldareusingthisbrandoftoothpasteeveryday.Myteacherwenttothebookstoreandboughtdozensofbooks.2.表示年岁时，用“inone’s+逢十的基数词的复数”。如：inhisforties。3.表示年代时，用“inthe+逢十的基数词的复数”。基数词的复数若用阿拉伯数字表示，可直接加s，也可加’s。如：inthe1950’s/1950s。二、序数词1.序数词前通常要加定冠词the或与物主代词一起使用，在句中可作主语、宾语、定语和表语等。2.序数词前也可加不定冠词，表示“再一，又一”。如：athirdtime,athirdandafourth等。三、分数词1.分数词是由基数词和序数词构成，分子用基数词表示，分母用序数词表示；除了分子为1的情况下，序数词都要用复数形式。如：1/3onethird；3/5threefifths。2.“分数/百分数+of+名词/代词”作主语时，谓语动词的数与名词或代词的数保持一致。如：Two-thirdsofhersparetimeisspentonhousework.80percentofthehousesweredamagedinthebigearthquake.四、常见考点高考对数词的考查主要集中在年龄表达法、年代表达法、序数词前加冠词及数词作主语时的主谓一致等。【考例】One-thirdofthecountry_______coveredwithtreesandthemajorityofthecitizens_____blackpeople.A.is;areB.is;isC.are;areD.are;is根据括号内的汉语提示补全下列句子（每空一词）。1.Early______________(二十世纪七十年代)noonehadanyideathatthewomanwouldbecomeamillionairebyplantingflowers.inthe1970s2.Thereareagreatmanyoverseasstudentsinouruniversity,___________________(他们当中五分之二)comefromAsia.3.Everydayinmodernsociety_________________________(几百万顾客)goshoppingontheInternet.4.____________________(每三年),scoresofstudentsfromtheforeignlanguageschoolaresenttoBritaintolearnEnglish.Everythreeyearstwo-fifthsofwhommillioncustomersseveral5.Youcangototherailwaystationonfoot.Itisonly____________________(十分钟的旅程).6.Accordingtotherules,ifyouare__________________________(十八岁以下),youaren’tadmittedintotheclub.7.Tomlookedquitehealthythoughhewas________________(七十多岁了).inhisseventiesaten-minutetripeighteenyearsoldunder