不定冠词

1. 不定冠词指任何一类人、动物或事物

An ocean is bigger than a sea. 洋比海大。

A car must be insured. 汽车一定要上保险。

2. 不定冠词表示某个人或物

There is a Mr Bush to see you. 有位布什先生要见你。

English is a useful tool in our communication.

英语是我们交流中一种有用的工具。

3. 不定冠词用在某些数字表示的短语中

a million years一百万年      a score of people 二十人 

a dozen eggs 一打鸡蛋        a thousand people 一千人 

4. 不定冠词用在价格、速度、比率等短语中

5 pence a dozen 5便士一打          60 kilometers an hour 每小时六十公里 

twice an hour 每小时两次           forty hours a week 每星期40小时

5. 不定冠词用于某些习语

a long time 很长时间             a few 有几个 
a little 有一点                  get a grip of 掌握 
in a word 总而言之               in a temper 生气 
keep an eye on 照看              have a gallop 快马加鞭 
take a walk 散步                 at a loss 不知所措 
have a try 试一下                make a fool of… 捉弄…… 
all of a sudden 突然             on a large scale 大规模地 
make a racket 大声喧哗           in a hurry 急忙 
want a go 试一下                 as a matter of fact 事实上 
take a break 休息一下            take a bow 谢幕 
as a rule 通常                   put an end to 结束 
as a result 因此                 as a whole 一般地说 
come to an end 结束              have a good time 玩得痛快 
with a view to 为了              with a will 决心 
have a cold 患感冒               it's a pity that ... 真可惜 
in a way 有些                    have a rest 休息一会儿 
make a living 谋生               have a word with 与……谈话 
make a fire 生火                 make a fortune 发财 
make a study of 研究             take an interest in 对……感兴趣