| 1. 不定冠词主要表示泛指和与one 同源,含"一"的意思。a 用在以辅音音素开头的名词前,an 用在以元音音素开头的名词前,如: a university   a man   a book
 an umbrella   an egg   an honest child
   2. 定冠词 the 主要表示特指的人或物及第二次提到的人或物,或世界上独一无二的东西,如:the sun   the moon  the world   the earth
   和形容词连用,代表一类人,如:the blind   the dead   the poor   the rich
 he wounded  the young  the unemployed
   3. 在下列情况下不用冠词:a. 特殊的专有名词前,如:
 John Smith
   b. 物质名词表示类别时,如:Gold is a precious metal.
   c. 抽象名词表示泛指时, 如:Knowledge is power.
   d. 在季节、月份、日期、节日前,如:February
   e. 在餐名、运动、游戏等名词前,如:Sports is good for health.
   f. 在school, hospital, church, prison等词前,当这些词着重表示功用而不是这些建筑物或物体本身时,如:She went to school at seven.
 (但 She went to the school to see 
              her teacher.)
   g. 在表示"种类"的短语,如:a kind (sort) of tree,
 two kinds (sorts) of books.
   h. 带有表示顺序的基数词前,如:Lesson One (但 the First Lesson).
   i. 表示独一的职位,头衔等的名词前,如:He was elected president of the 
              society.
 
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