冠词定义:冠词是虚词,本身不能单独使用,也没有词义,它用在名词前,帮助指示名词的含义分类:冠词分为不定冠词( a, an ),定冠词( the ),和零冠词。I. 不定冠词的用法:1 指一类人或事,相当于a kind ofA plane is a machine that can fly.2 第一次提及某人某物,非特指A boy is waiting for you.3 表示“每一”相当于 every , oneWe study eight hours a day.4 表示“相同”相当于 the sameWe are nearly of an age.用于人名前,表示不认识此人或与5某名人有类似性质的人或事A Mr. Smith came to visit you when you were out That boy is rather a Lei Feng.6用于固定词组中A couple of, a bit,once upon a time, i