冠词即不用冠词,用于不可数名词,复数可数名词和某些单数可数名词前（1）专用名词、物质名词、抽象名词、人名、地名等名词前面一般不加冠词Knowledgeispower.Wecan'tlivewithoutair.Chinahasalargepopulation.（2）表示头衔、职务的名词作表语、同位语、宾语补语、主语补语时不加冠词AbrahamLincolnwaselectedpresidentoftheUnitedStatesin1860.WangPing,monitorofClassThree,wonthefirstprize.但是,当这些名词作主语时,要加定冠词：ThepresidentofUSAwillvisitAmericainthenearfuture.ElizabethII,__/_QueenofEngland,declaredtheconferenceopen.（3）称呼语前面不加冠词Whereareyougoing,mumJimmysaidthat/Unclehadn'tcomebackand_/__Auntiewasout.Thegeneralorderedhismen,"Useyourknife,youngman!"（4）泛指复数名词前面不加冠词We'reSeniorThreestudents.——Whatarethey——They'reworkers.（5）by+交通工具／通讯工具A.——Doyouknowhowhewillcomehere——Ithinkhe'llcomeherebybus/train/taxi/ship/plane/bike.B.I'lltellyoubytelephone/email.但是使用其他介词时要注意：He'llcomeinhertaxi/onherbike/onabus.You'rewantedonthetelephone.（你有电话.）（6）用在介词at／by后面,表示时间,不加冠词atdaybreak/dawn/dusk/noon/sunrise/sunset/nightB.Mostpeopleworkbydayandrestbynight.（大多数人白天工作晚上休息.）（7）在turn（变成,成为）后面的名词前面不加冠词Hissonturnedwriteratlast.=Hissonbecameawriteratlast.（8）几个词组inspace/indistance/peace/publicbychance/accident/surpriseonfoot/duty/earthoutofbreath/reach/sight/control