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英语语法之冠词02-不定冠词a,an用法


2. 不定冠词;a/an;泛指 
 
A和AN 的区别
 
a 用在以辅音音标开头的词前, an 用在以元音音标开头的词前。如:
a house, a useful book, a one-eyed camel, a European village ,a uniform a university, a usual thing , an hour, an umbrella, an office,an honest boy, an English book, an apple, an eight-year-old boy
注; There is a “u” and  an “s” in the word “us”
 
a, an 和one的区别
a, an 表示“一”,但数量概念没有one 强烈。如:
They waited there for an hour.他们在那等了一个小时。
I have one house.
如特别强调数量,应使用one。如:
I have only one dictionary and I need it myself.
 
不定冠词用法口诀:
a, an 表泛指,首次提到地。
计量单位名词前表每一
序数词前表又一
专有名前表某一
固定搭配记记记
还有啥好方法尼?
 
(1) a, an 表泛指,首次提到地:  如: 
My mother works in a hospital.
I have a new friend.
 
(2) 计量单位的名词前,如时间、速度、价格等,表示“每一”,相当于per 或every。如;
The plane can get 300 kilometers an hour.飞机的速度是每小时300 公里。
The doctor told her to take the medicine three times a day. 医生叫她一天服三次药。
 
(3) 序数词前表又一: 如:
He has already eaten two apples, but he wants a third one.
He tried a sixth time and finally succeeded.他又尝试了第六次,最终成功了。
 
(4) 专有名词(人名、地名)前表某一:类似的一个。 如;
 A Mr. Li has been waiting for you. 
 Harbin is called a Russia of the East. 
 
(5) 固定搭配
in a moment 立刻,马上 once upon a time 从前 as a result (of)作为(……)的结果
in a hurry 急忙地  in a word 一句话,总而言之 once in a while 偶尔地
have a good time 过得很愉快    have a word with 与……说句话 
have/take a look (at)看一看    have/take a rest 休息一下
do sb. a favor 帮某人的忙      put an end to 结束 
at a mouthful 一大口地        all of a sudden 突然地
once upon a time 曾经              at a loss 亏本,不知所措
For a while 暂时,一会儿        all of a sudden 突然              
tell a lie   撒谎                  at a distance  在一定的距离内;隔开一点      
a waste of  浪费                    Have/take a rest  休息              
 get a lift/ride 搭便车             go on a diet 节食