摘要：定冠词的基本用法: ① 表示上文提到过的人或事物.如:I have bought a book. The book is very useful. ② 用于说话人与听话人心中都有数的人或事物.如:Close the window, please. ③ 用于表示世界上独一无二的事物前.如:the sun, the moon, the earth, the world等. ④ 用于表示方位的名词之前.如:the east, the right. ⑤ 用于序数词或形容词的最高级之前.如:the first, the tallest. ⑥ 用于形容词之前.使其名词化.如:the sick, the wounded. ⑦ 用于由普通名词构成的专有名词之前.如:the United States, the United Nation. ⑧ 用于江河.海洋.海峡.山脉.群岛.建筑物等的名词之前.如:the Changjiang River, the East Lake. ⑨ 用于复数姓氏之前.表示“夫妇 或“全家 .如:The Smiths ⑩ 用于乐器的名词前.如:play the piano; play the violin. ⑾ 发明物.如:The compass was invented in China. ⑿ 年代名词前.如:He lived in the countryside in the 1970s. ⒀ 固定词组中.如:in the morning, on the other hand , at the same time

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