定冠词：特指 the                      i  want the bike.

冠词

              不定冠词:  广泛      a/an             I want a book

 

1.冠词的用法

These cakes are tasty. Would you like  a  third one?

This is  a most useful book for English learners.// a most == very 

a: 表示   又一个    非常

 

A Mr.Green called this morning.

The Greens are sitting at the table. // The + 姓史 表示一家人

 

// a 一份

Let me buy you a beer/chocolate/sandwich.

Two coffees, please.

 

2.定冠词用法

I have a dog. The dog is very cute.

The air is free but precious.  // earth/moon/sun

                                         // sky/world/universe

                                         // a big/red/sun

 

形容词 比较级、最高级前面      The poor/rich/old/blind/unkonw/disabled.

                                            He is the taller of the two children.

                                            This is the best lesson  i've ever had.

 

I want the third one.                       序数词       the last/same/next/right/wrong.

You're the only one I want.

 

I can play the guitar, but not the piano.// 乐器

i'm paid by the hour/day/week/month/year

Eggs are sold by the dozen.// 12

 

季节、月份、星期、节假日、三餐、学科、球类、棋类、疾病、

独特意义的专有名词：人名、地名、街道名

he is dean of our department.// 独一无二

he is a dean of our department.// 有多个系主任