一、冠词的用法
冠词是虚词，放在名词之前，用来说明名词指的人或事物。冠词有两种。
A（an）叫不定冠词，the叫定冠词。A用在辅音之前，an用在元音之前。
1. 不定冠词的用法
（1）a和an均用在单数名词之前，表示某一类人或事物。例如：
John is a student.
Mary is an English teacher.
（2）指某一类人或事物中的任何一个。例如：
A steel worker makes steel.
Pass me an apple, please.
（3）指某人或某物，但不具体说明何人或和物。例如：
A student wants to see you.
A girl is waiting for you outside.
（4）表示每一的意思，相当于every。例如：
Take the medicine three times a day.
They go to see their parents once a week.
2.定冠词用法
（1）特指某（些）人或某（些）事物。例如：
The book on the desk is an English dictionary.
Beijing is the capital of China.
（2）指说话人和听话人都熟悉的人或事物。例如：
Open the door, please.
Jack is in the library.
（3）上文提到过的人或事物。例如：
Yesterday Johns father bought him a new bike. The bike cost him 200 yuan.
（4）表示世界上独一无二的事物。例如：
The sun rises in the east and sets in the west.
（5）用在序数词和形容词最高级之前。例如：
Shanghai is the biggest city in China.
January is the first month of the year.
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