什么是不定冠词？ 什么叫定冠词，什么叫不定冠词？
\u4ec0\u4e48\u662f\u5b9a\u51a0\u8bcd\uff0c\u4ec0\u4e48\u662f\u4e0d\u5b9a\u51a0\u8bcd\u51a0\u8bcd\u662f\u865a\u8bcd\uff0c\u672c\u8eab\u4e0d\u80fd\u5355\u72ec\u4f7f\u7528\uff0c\u4e5f\u6ca1\u6709\u8bcd\u4e49\uff0c\u5b83\u7528\u5728\u540d\u8bcd\u7684\u524d\u9762\uff0c\u5e2e\u52a9\u6307\u660e\u540d\u8bcd\u7684\u542b\u4e49\u3002\u82f1\u8bed\u4e2d\u7684\u51a0\u8bcd\u6709\u4e09\u79cd\uff0c\u4e00\u79cd\u662f\u5b9a\u51a0\u8bcd\uff08the Definite Article\uff09\uff0c\u53e6\u4e00\u79cd\u662f\u4e0d\u5b9a\u51a0\u8bcd\uff08the Indefinite Article\uff09\uff0c\u8fd8\u6709\u4e00\u79cd\u662f\u96f6\u51a0\u8bcd\uff08Zero Article\uff09\u3002
\u4e0d\u5b9a\u51a0\u8bcda (an)\u4e0e\u6570\u8bcdone \u540c\u6e90\uff0c\u662f"\u4e00\u4e2a"\u7684\u610f\u601d\u3002a\u7528\u4e8e\u8f85\u97f3\u97f3\u7d20\u524d\uff0c\u4e00\u822c\u8bfb\u4f5c[e]\uff0c\u800can\u5219\u7528\u4e8e\u5143\u97f3\u97f3\u7d20\u524d\uff0c\u4e00\u822c\u8bfb\u505a[en]\u3002
1) \u8868\u793a"\u4e00\u4e2a"\uff0c\u610f\u4e3aone\uff1b\u6307\u67d0\u4eba\u6216\u67d0\u7269\uff0c\u610f\u4e3aa certain\u3002
A Mr. Ling is waiting for you.
2) \u4ee3\u8868\u4e00\u7c7b\u4eba\u6216\u7269
A knife is a tool for cutting with.
Mr. Smith is an engineer.
\u5b9a\u51a0\u8bcdthe\u4e0e\u6307\u793a\u4ee3\u8bcdthis\uff0cthat\u540c\u6e90\uff0c\u6709"\u90a3\uff08\u8fd9\uff09\u4e2a"\u7684\u610f\u601d\uff0c\u4f46\u8f83\u5f31\uff0c\u53ef\u4ee5\u548c\u4e00\u4e2a\u540d\u8bcd\u8fde\u7528\uff0c\u6765\u8868\u793a\u67d0\u4e2a\u6216\u67d0\u4e9b\u7279\u5b9a\u7684\u4eba\u6216\u4e1c\u897f\u3002
\u5b9a\u51a0\u8bcd\u7684\u7528\u6cd5:
1\uff09\u7279\u6307\u53cc\u65b9\u90fd\u660e\u767d\u7684\u4eba\u6216\u7269\uff1a
Take the medicine. \u628a\u836f\u5403\u4e86\u3002
2\uff09\u4e0a\u6587\u63d0\u5230\u8fc7\u7684\u4eba\u6216\u4e8b\uff1a
He bought a house. I've been to the house.
\u4ed6\u4e70\u4e86\u5e62\u623f\u5b50\u3002\u6211\u53bb\u8fc7\u90a3\u5e62\u623f\u5b50\u3002
3\uff09\u6307\u4e16\u4e0a\u72ec\u4e00\u7269\u4e8c\u7684\u4e8b\u7269\uff1a
the sun\uff0c the sky\uff0c the moon\uff0c the earth
4\uff09\u5355\u6570\u540d\u8bcd\u8fde\u7528\u8868\u793a\u4e00\u7c7b\u4e8b\u7269\uff0c\u5982\uff1athe dollar \u7f8e\u5143;
the fox \u72d0\u72f8\uff1b\u6216\u4e0e\u5f62\u5bb9\u8bcd\u6216\u5206\u8bcd\u8fde\u7528\uff0c\u8868\u793a\u4e00\u7c7b\u4eba\uff1athe rich \u5bcc\u4eba; the living \u751f\u8005\u3002
5\uff09\u7528\u5728\u5e8f\u6570\u8bcd\u548c\u5f62\u5bb9\u8bcd\u6700\u9ad8\u7ea7\uff0c\u53ca\u5f62\u5bb9\u8bcdonly\uff0c very\uff0c same\u7b49\u524d\u9762\uff1a
Where do you live? I live on the second floor. \u4f60\u4f4f\u5728\u54ea\uff1f\u6211\u4f4f\u5728\u4e8c\u5c42\u3002
That's the very thing I've been looking for. \u90a3\u6b63\u662f\u6211\u8981\u627e\u7684\u4e1c\u897f\u3002
6\uff09\u4e0e\u590d\u6570\u540d\u8bcd\u8fde\u7528\uff0c\u6307\u6574\u4e2a\u7fa4\u4f53\uff1a
They are the teachers of this school.\u6307\u5168\u4f53\u6559\u5e08)
They are teachers of this school. (\u6307\u90e8\u5206\u6559\u5e08)
7\uff09\u8868\u793a\u6240\u6709\uff0c\u76f8\u5f53\u4e8e\u7269\u4e3b\u4ee3\u8bcd\uff0c\u7528\u5728\u8868\u793a\u8eab\u4f53\u90e8\u4f4d\u7684\u540d\u8bcd\u524d\uff1a
She caught me by the arm.. \u5979\u6293\u4f4f\u4e86\u6211\u7684\u624b\u81c2\u3002
8\uff09\u7528\u5728\u67d0\u4e9b\u7531\u666e\u901a\u540d\u8bcd\u6784\u6210\u7684\u56fd\u5bb6\u540d\u79f0\u3001\u673a\u5173\u56e2\u4f53\u3001\u9636\u7ea7\u3001\u7b49\u4e13\u6709\u540d\u8bcd\u524d\uff1a
the People's Republic of China \u4e2d\u534e\u4eba\u6c11\u5171\u548c\u56fd
the United States \u7f8e\u56fd
9\uff09\u7528\u5728\u8868\u793a\u4e50\u5668\u7684\u540d\u8bcd\u4e4b\u524d\uff1a She plays the piano. \u5979\u4f1a\u5f39\u94a2\u7434\u3002
10) \u7528\u5728\u59d3\u6c0f\u7684\u590d\u6570\u540d\u8bcd\u4e4b\u524d\uff0c\u8868\u793a\u4e00\u5bb6\u4eba\uff1a
the Greens \u683c\u6797\u4e00\u5bb6\u4eba (\u6216\u683c\u6797\u592b\u5987)
11) \u7528\u5728\u60ef\u7528\u8bed\u4e2d\uff1a
in the day, in the morning (afternoon\uff0cevening), the day after tomorrow
the day before yesterday, the next morning,
in the sky (water\uff0cfield\uff0ccountry)
in the dark, in the rain, in the distance,
in the middle (of), in the end,
on the whole, by the way, go to the theatre
\u5b9a\u51a0\u8bcd\uff1athe\uff0c\u7528\u4ee5\u8868\u793a\u7279\u6307\u67d0\u4e00\u4e2a\u6216\u67d0\u4e00\u4e9b\u4eba\u6216\u7269
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an\uff0c\u7528\u4ee5\u8868\u793a\u6cdb\u6307,\u7528\u8bed\u8868\u793a\u67d0\u4e00\u7c7b\u4eba\u6216\u7269
Rome was not built in a day.
罗马不是一天建成的。
The plan will be ready in a week or two.
计划一两周内就可定好。
How much is it?-- Twenty cents a catty.
怎么卖？——两毛一斤。
A stitch in time saves nine.
及时（缝）一针顶十针。
这种用法在表示重量、长度、时间等的词组中特别普遍，例如：a pair of socks, a hundred, two yuan a metre, eight hours a day, twice a week, a cup of coffee, a handful of, at a blow, at a stretch, one at a time, in a word, at a glance.
不定冠词也可用来表示“某一个”（仍然译作“一个”）：
A professor from their university is coming to give us a talk.
他们大学的一位教授将来给我们做报告。
This poem was written by a student.
这首诗是一个学生写的。
At that time I was working in a factory.
那时我在一家工厂工作。
She picked up a magazine and began to read.
她拿起一本杂志开始看起来。
至于究竟指哪个人或东西这里是看不出来的，如果指某特定的人或东西，就必须用定冠词，例如：
Where is the professor from their university?
他们大学来的那位教授在哪里？
在作表语或同位语用的名词前加不定冠词的情形也是很多的，这时主要说明某个人或东西是属于哪一类：
This is a sanatorium for textile workers.
这是一所纺织工人疗养院。
The peasant girl has now become an engineer.
这个农村姑娘现在成了工程师了。
Is this a planer or a lathe?
这是刨床还是车床？
This is Mr. Brown, a member of the trade union committee.
这是工会委员布朗先生。
这种表示类别的用法在下面这类句子中也可以看到：
He worked as a language teacher in that university.
他在那所大学里任语文教员。
She was soon accepted as a member of the club.
不久她就被接受加入了这个俱乐部。
We all thought him a suitable person for the job.
我们都认为他是适合这项工作的人。
不定冠词还可以和名词一起来代表一类人或东西：
A teacher must love his students.
老师应当爱学生。
The best way to learn a language is to live among its speakers.
学语言最好的办法是生活在说这种语言的人当中。
A semi-conductor has some important properties.
半导体有一些重要的特性。
Even a child can answer this question.
就是小孩子也能回答这个问题。
不定冠词在表示“一个”或“某一个”意思的时候，在译为汉语时，一般都有“一”字出现。在不定冠词表示类别时，译为汉语时“一”字是不一定出现的。正因为这样，我们在表示这类意思时，常常受汉语的影响，忘了加冠词，因此必须特别注意。一般来说，可数名词单数，如果是泛指，前面总是要加不定冠词的。另外不定冠词在表示类别时，如果要把不定冠词后的名词变为复数，只要把不定冠词去掉就行了，因为可数名词复数也有表类别的作用，如：
These are sanatoria for textile workers.
Are they planers or lathes?
Teachers must love their students.
Semi-conductors have some important properties.
而不定冠词表示“一个”或“某一个”的时候，如果把不定冠词的名词变为复数，但把不定冠词去掉还不行，还得补上一个数词或不定代词（如：some, any等），如：
The plan will be ready in a few weeks.
Some professors from their university are coming to speak here today.
She picked up two magazines and began to read.
这是因为“一个”或“某一个”变为复数时就成为“几个”或“某几个”的缘故。
1.冠词指不定冠词a,an和定冠词the
2.不定冠词an常用于元音发音开头的词前，
如：an hour,an English car. 请区别：a useful machine
3.指上文提到过的人或物，用定冠词the
4.在世界上独一无二的事物前用定冠词the.如：the sun,the moon,the earth
5.定冠词the用于序数词前，表示方位的名词和形容词最高级前。
如：the first,the best ,in the south
6.在复数姓氏前加the，表示××一家人，常看成复数。
如：The Browns are going to Shanghai for a holiday this summer.
7.在介词短语中常用定冠词the，如：in the box ,behind the chair
8.特别注意不能用定冠词the的几个方面：
(1)在节日、星期、月份、季节、年等词前不用冠词。如：in summer,in August
请区别：in the spring of 1945. (这里表示特指，故加the)
(2)一日三餐和球类运动名不用冠词。 如：have breakfast ,play football
(3)一些固定词组中，如：go to bed ,go to school,by bus ,at night.
9.在有些词组中，有冠词和无冠词意思不同，请注意区别：
in front of 在…前面
in the hospital 在医院里
in the front of 在…范围内的前部
in hospital (生病)住院
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