1. 用在可数名词单数的前面,表示一类人或事物。 The bird lives in the tree.
2. 指双方都知道的人或物。 —Where are the new books, Tom
—They are on the small table.
3. 指上文提过的人或物。 I’ve got a new pen. The pen is blue.
4. 用在世界上独一无二的事物前。 The sun is bigger than the moon.
5. 用在序数词或形容词最高级以及only前。 The first truck is carrying a few baskets.
The third one is carrying the fewest of all.
6. 用在由普通名词构成的专有名词前。 the Great Wall
7. 用在江河、湖泊、山脉、群岛的名称前面。 the West Lakes
8. 用在乐器前面。 play the guitar
9. 用在姓氏的复数前面,表示夫妇两人或一家人。 the Greens
10. 用在某些形容词前,表示一类人。 We should take good care of the old.
11. 用在一些习惯用语中。 in the morning(afternoon,?evening),
on the left(right), at the end of