对牛弹琴
Talking over one’s Head
Playing the Lute to a Cow
Thowing Pearls before Swine
--（01没有普通名词的专有名词）Gong Sunyi was__（a1单数可数名词前表示一个，某一类中任何一个）ancient musician. He liked to play__（02球类，棋类）chess and__（the1乐器前）lute.He lived near__(the2有普通名词的专有名词)Yellow River. There were__（03泛指复数）large grasslands and__（03泛指复数）many cows.On__（04年份，月份，星期前）July 6th,707B.C.,it was__（05除带eve以外的节日前）Eve of Chinese Valentine’s Day. Gong Sunyi went out, sat to __(the3方位)east of__（a2第一次提到）cow and played__（the1乐器前）lute to him. He played GaoShanLiuShui pleasantly, but__（the4上文中提到的或说话双方已知的）cow still ate__（06抽象，物质，不可数）grass and paid no attention to__（the4）music.‘Oh my__(07前有指示，物主或者不定代词，名词的所有格)cow, maybe you like __（06）rock music.’Gong Sunyi thought.
总结：
不定冠词a,an（区别是看后面单词发音，而不是字母）通常放在可数名词单数前，表泛指。

1，单数可数名词前表示一个=One,或者某一类中的任何一个。

2，第一次提到
3，表示类别.A cow is a very strong animal.
Cow is a very strong animal.
The cow is a very strong animal.
4，固定词组have a look, have a try, a lot of, a great many
定冠词the(注意读音)可放在任何名词前。

表示特指。

1，乐器前
2，有普通名词的专有名词前
3，方位，方向前
4，上文中提到过的或者说话双方已知的。

Please open the door.
5，世界上宇宙上独一无二的事物。

The sun, the moon, the earth, the sky
6，序数词和最高级前三月是一年中的第三个月份。

March is the third month of the year.
I am the oldest in our class.
7,固定搭配in the morning in the afternoon go to the cinema
零冠词
1，没有普通名词的专有名词前。

人名Lv Ping国家名China城市名QingDao地名Tong’an Street
2，球类，棋类
3，泛指复数
4，年份in 2012，季节in spring，月份on March，星期on Sunday，节日on Children’s Day 5，抽象，物质，不可数名词
6，前已经有指示，物主，不定代词和名词的所有格。

7，固定搭配have fun, go to school, have dinner。