a, an, the的用法
（一）a, an的用法
1.a：用于辅音音素（不是辅音字母）开头的词前，表示单数的数量：“一”。

但小学阶段学生一般理解为：单词开头第一个不是元音用a
a book 一本书 a desk一张书桌
2.an：用于元音音素（不是元音字母）开头的词前，表示单词的数量“一”。

但小学阶段学生一般理解为：单词第一个字母是元音字母用an
an apple 一个苹果 a big apple一个大苹果an old man一位老人
3.元音字母：Aa, Ee, Ii, Oo, Uu
4.特殊情况：an hour（h是辅音字母，但它不发音）
5.辅音字母：26个字母中，除了5个元音字母，其他是辅音字母
练习一：用a, an, the填空
1._____book
2._____apple
3._____orange
4._____uncle
5._____eraser
6._____math book
7._____new book
8._____old book
9._____teacher 10.______English 11.____ hour 12._____good teacher 13.____idea 14.____good idea 15.____island 16.____ astronaut
（二）the的用法
1.一般用于特指：The girl is my sister. 那个女孩是我的妹妹。

2.第二次出现：There is a book on the desk. The book is mine. 书桌上有一本书，那本书是我的。

3.世界上独一无二：the moon月亮the earth地球the Great Wall长城the sun太阳
4.固定的词组：on the desk在书桌上
5.形容词最高级前：Jenny is the oldest girl in the class. 在班里珍妮是年纪最大的女孩。

练习二：选择
( )1.That’s _____ island. I like to go there. A.a B.an C.the
( )2.I have ___ new book. Jenny has ___ old book. A.a/ an B.an/ a C.an/ an
( )3.This is ___ orange. That’s ____big orange. A.a/ an B.an/ a C.an/ an
( )4.Yesterday I studied English for ____ hour. A.an B.the C.a
( )5.This is a bag. ____ bag is Tom’s. A.A B.An C.The
( )6.___ man is Lisa’s father. A.A B.The C.An
( )7.____ Great Wall is in China. A.A B.The C.An
( )8.My English book is in ___ desk. A.the B.an C./
( )9.She has ___ idea. It’s a good idea. A.a B.an C.the
练习三：a, an, the填空
1.Tom wants to be _____ scientist(科学家).He wants to go to ___ moon.
2.Jenny has ______ uncle and _____ cousin.
3.I have _____ eraser. _____ eraser is in my bag.
4._____ boy is Tom’s brother.
5.The bird was here ______ hour ago.
6.There is _____ English book on the desk. ______ English book is Tom’s.
7.I have _____ book. It is _____ English book. And it has _____ goos story. _____ book is in my bag.
8.There is _____ cat under the tree. _____ cat is playing.。