有时名词前无冠词，但并非不用冠词，而是省去了不定冠词和定冠词。在下列情况下冠词可省略。

避免重复
The lightning flashed and thunder crashed. 电闪雷鸣。（thunder 前省去 the。)
The noun is the name of a person or thing. 名词是人或物的名称。（thing前省去a。）
可省去句首的定冠词 the
Class is dismissed. 下课了。
Fact is that they do not know him. 事实是他们并不认识他。

在 the next day 等短语中，定冠词 常省去
Next day they went to London together early. 第二天，他们很早就一起到伦敦去了。
The circus is coming here next week. 马戏团下星期来这儿。

信函地址常省去定冠词或不定冠词
English Dpt.
Foreign Studies University
Beijing,China
中国北京外国语大学英语系

含有a的词组
have a word with sb. 和某人谈话
have a drink 喝点什么
many a time 许多次
have a good time 过得愉快
have a swim游泳
have a bath/shower 洗澡,淋浴
have a look (at) 看一看
have a fever 发烧
give a lesson 授课
in a/one word 总之（一句话)
have a talk谈话
have/take a walk 散步
have a nice trip 旅途愉快
have a rest 休息一下

含有the词组
in the daytime在白天
at/in the beginning 开始
in the middle night 在半夜
in the end 最后,终于
by the way 顺便说一下
the same as... 同..一样
in/at the front of...在某物的前部
on the right/left 在右边/左边
in the morning/afternoon/evening 在上午/下午/晚上