解放军文职考试：不定冠词的用法

 (1)用于泛指人或事物

　　She wanted to rent an apartment near the campus. .她想在学校附近租一套房子。

　　Before she left for London, Sally sent me a picture of herself. 萨莉动身去伦敦前送给我一张她的照片。

　　A grammar book is necessary to a language learner. 对语言学习者来说，语法书是很必要的。

　　A teacher likes putting a watch on his / her desk while lecturing .老师讲课时总爱将手表放在讲台上。

　　(2) 用于某些词组中。这种用法是约定束成的，我们只有遵从，没有别的选择。例如：

　　have a rest(休息) have a look(瞧瞧) have a good time(过得开心)

　　take a shower(淋浴) take a break(休息) take a bath(洗澡)

　　have a cold(患感冒) get a fever(发烧) develop into a habit (养成习惯)

　　make a living(谋生) make a guess at(猜测) make a difference between(区分)

　　in a moment(过一会儿) in a sense(在某种意义上) in a way(在某种程度上)

　　once in a while(间或) have an advantage over(优于)

　　have an edge(略胜过)as a result(因此)as a rule(通常)as a whole(总体上说)

　　(3)在名称或唯一地名前禁用：

　　例：Mr.Green lives in Bridge Stree.