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一、不定冠词的用法
1.泛指某个或某类人或物。
I was born in a small village in Shandong Province.
A child needs not only food and clothes, but love as well.
2.当抽象名词表示具体的人或事物时(即抽象名词具体化)，前面用不定冠词。
The party held last weekend was a great success.
3.表示“一”或“每一”概念。
I go back home once a month.
Tom drives his car at 60 miles an hour.
4.表示不明身份或说话人不清楚的人或事物。常译作“一个叫……的人/物”。
A Smith called you just now.
5.不表示比较意义的形容词最高级前可用不定冠词。
Hiking is a most interesting outdoor activity.
6.不表示顺序而是表示“又一，再一”的序数词前用不定冠词。
They have a second house in the country.
7.knowledge/grasp/command/collection/understanding等一些由动词转化而来的抽象名词后接of...时，前面用不定冠词。
He has a good knowledge of English.
Media help us to have a better understanding of the world.
8.独一无二的事物前有修饰成分时可用不定冠词。
a full moon一轮满月a brandnew world一个崭新的世界
9.表示三餐、星期、月份、季节等的名词前有形容词修饰或表示特定含义时前用不定冠词。
I remember it was on a rainy Monday that he left his hometown.
二、定冠词的用法
1.特指双方都知道的或上文中提到的人或物。
What a pity that you couldn’t be there to receive the prize!
2.用在形容词或分词前，表一类人或物。
Many of the injured are still in a serious condition.
3.用在姓氏名词的复数形式前，表示一家人或夫妇俩。
I paid a visit to the Turners last week.
4.用在方位名词、乐器名词和宇宙中独一无二的事物前。
the east东部play the piano弹钢琴
the universe宇宙the moon月亮
5.用在序数词、比较级(两者相比较，表示特指的时候)、最高级和形容词only，very(恰好是)，same前。
It’s the first time that I have been to China.
Which story is the more interesting of the two?
We were the only people there.
6.用于固定结构“动词+sb.+介词+the+身体部位”中。
take sb. by the arm 拉着某人的胳膊
hit sb. in the face/on the nose 打某人的脸/鼻子
7.用在由普通名词构成的专有名词前。
The foreigners who come to China all want to travel to the Great Wall.
8.用在表示世纪、年代的词前。
The book was published in the 1980s.
9.the用于表示时间或度量单位的名词前，如：by the hour/day/ week/month/year/dozen/yard/ton/kilo，但是size/weight/time这类名词跟by连用时不加冠词。
Workers are usually paid by the hour.
These goods are sold by weight.
定冠词用法口诀
特指、熟悉和重提，复数姓氏、最高级;
独一无二和年代，序数词、方位和乐器;
普通名词专有化，固定结构要牢记。
