| 用法 | 例句 |
| 用于可數(shù)名詞單數(shù)形式前 | Susan is a scientist. Pass me an orange, please. |
| 不特指某人或某物 | A boy is looking for you. We work five days a week. |
| 表示“一”的數(shù)量,但沒有one強(qiáng)烈 | We are going to have an English lesson tomorrow. I have a mouth, a nose, two eyes and two ears. |
| 用于固定詞組中 | A few, a little, a lot of, a moment ago |
| 用法 | 例句 |
| 特指某人或者某物 | Show me the photo of the boy. |
| 雙方都知道的事物或人 | Where are the new books, Jim? They are on the small table. |
| 上文提過的人或物 | Ji Wei lives on a farm. The farm is not big. |
| 獨(dú)一無二 | The sun is bigger than the moon. |
| 序數(shù)詞和形容詞最高級(jí)前 | The first month of the year is January. |
| 普通名詞構(gòu)成的專有名詞前 | The Great Wall |
| 習(xí)慣用語 | In the morning On the left |