3.定冠词the的常见用法：
用法 例 句
用在序数词前 Tom is always the first to get to school.
用在形容词最高级前 Is it the most difficult lesson in this term?
特指双方都知道的人/物 Did you go to the hospital just now?
指前面出现的人/物 He has a dog.The dog is named Huzi.
指世上独一无二的事物前 The sun rises in the east.
用在被修饰限定的人/物前 Do you know the boy talking with our teacher?
乐器、文娱等名称前 She plays the piano.
注：play football
年代数词前 In the 1960s China is in disorder.
方位、方向名词前 Please turn to the left.
用在姓氏复数前表一家人或夫妇 The Smiths are having dinner.
用在某些形容词，表一类人/物 The English are friendly.
用在阶级、机构、党派的名词前 America is a member of the United Nations.
江河、海湖、海湾、海峡、群岛、山脉等的名词前 The Yellow River is the second longest river in China.
在固定搭配中 by the way，in the end