不定冠词的用法(1)a用在子音前;an用在母音前.Anhour(2)表同种类的全体,此时a带有any的意味.Adogisafaithfulanimal.(=Dogsarefaithfulanimals.)(3)等于one.Ihaveasisterandtwobrothers.(4)等于thesame.Birdsofafeatherflocktogether.(5)等于per“每一.”.Weworkeighthoursaday.Ninetymilesanhour.(6)a=acertain,表说话者不认识此人.DoyouknowaMr.Smith?(7)物质名词或抽象名词加a(an)即成普通名词,Asparagusisagrass.(a=akindof).Thisisagoodclothforsummer.(8)“have(ortake)a抽象名词”,与抽象名词的动词形同义.Letustakeam.=Letusm.2.定冠词的用法(1)由于上下文的关系,某名词所指的东西已非常明显,或已有一定的范围,该名词应加the.Shutthedoor.Pleasepassmethecaster.(2)表该名词的总称.Thecowisausefulanimal.(=Cowsareusefulanimals.)(3)前面已提过的名词,再度提到时前面加the.Onceuponatimetherewasalittleboywholivedinacottage.Thecottagewasinthecountry,andtheboylivedthereallhislife.(4)用于为片语或子句所修饰的名词之前.ThisisthebookthatIpromisedtolendyou.(5)用在宇宙（独一无二）的天体名词之前.Thesun;themoon;thesky;theearth.(6)用在方位,方向等名词之前.Thesunrisesintheeastandsetinthewest.(7)乐器的名称前要加the.Toplaythepiano(violin,guitar,flute,etc.)(8)表示单位的名词前要加the.Gasolineissoldbythegallon.Meatissoldbythecatty.(9)在最高级的形容词或序数(thefirst...)之前要加the.Taiwanisthebestplacetolivein.(10)专有名词在下列情况可加the.(A)海、河、运河的名称：TheThames;theBahamas;(B)复数形的专有名词:TheWestIndies;theBahamas;(C)船泊的名称:TheQueenMary;theFlyingScotsman;theComet;(D)书报、杂志、经典的名称：theTimes;theCentralDailyNews;theKoran;(E)公共建筑、机关的名称:TheRitzHotel;theMinistryofEducation;(F)国民的总称:theFrench;theJapanese;theChinese;(G)用在姓氏的复数前指其全家人:TheChenswillmovetothecountry.