1)表示特指的人或事物。如：The man with a flower in his hand is Jack..(手上拿著一朵花的男人是傑克)
(2)指談話雙方都熟悉的人或事物。如：Look at the blackboard,Lily.(莉莉,請看黑板。)
(3)複述前面提到過的人或事物。如：There is a man under the tree. The man is called Robert.(樹下有個人, 那個人叫羅伯特。)
(4)表示世界上獨一無二的事物。如：The earth turns around the sun.(地球繞太陽旋轉。)
(5)用在表示方位的名詞前面。如：There will be strong wind to the south of the Yangtze River.(長江以南地 區將會颳大風。)
(6)在序數詞和形容詞最高階的前面。如：Who is the first one to go?(誰第一個去？) / Of all the stars, the sun is the nearest to the earth.(在所有的恆星之中太陽離地球最近)
(7)常用在樂器名稱的前面。如：He began to play the violin at the age of 5.(五歲時他開始拉小提琴)
(8)用在江河、海洋、山脈等名稱的前面。如：I have never been to the Himalaya Mountains.(我從來沒有去過喜馬拉雅山)
(9)用在含有普通名詞的專有名詞的前面。如：He is from the United States of America.(他來自美利堅合眾國)
(10)用在姓氏之前表示一家人。如：The Greens are going to Mount Emei next month.(下個月格林一家要去峨眉山)
(11)same之前一般用the。如：Lucy and Lily look the same.(露西和莉莉看上去長得一樣)
(12)幾個用定冠詞的習語：at the same time (與此同時),make the bed(鋪床),in the end(最後),all the time(一直),by the way(順便說一下),on the way(在路上)等等。這些是常見的
1)表示特指的人或事物。如：The man with a flower in his hand is Jack..(手上拿著一朵花的男人是傑克)
(2)指談話雙方都熟悉的人或事物。如：Look at the blackboard,Lily.(莉莉,請看黑板。)
(3)複述前面提到過的人或事物。如：There is a man under the tree. The man is called Robert.(樹下有個人, 那個人叫羅伯特。)
(4)表示世界上獨一無二的事物。如：The earth turns around the sun.(地球繞太陽旋轉。)
(5)用在表示方位的名詞前面。如：There will be strong wind to the south of the Yangtze River.(長江以南地 區將會颳大風。)
(6)在序數詞和形容詞最高階的前面。如：Who is the first one to go?(誰第一個去？) / Of all the stars, the sun is the nearest to the earth.(在所有的恆星之中太陽離地球最近)
(7)常用在樂器名稱的前面。如：He began to play the violin at the age of 5.(五歲時他開始拉小提琴)
(8)用在江河、海洋、山脈等名稱的前面。如：I have never been to the Himalaya Mountains.(我從來沒有去過喜馬拉雅山)
(9)用在含有普通名詞的專有名詞的前面。如：He is from the United States of America.(他來自美利堅合眾國)
(10)用在姓氏之前表示一家人。如：The Greens are going to Mount Emei next month.(下個月格林一家要去峨眉山)
(11)same之前一般用the。如：Lucy and Lily look the same.(露西和莉莉看上去長得一樣)
(12)幾個用定冠詞的習語：at the same time (與此同時),make the bed(鋪床),in the end(最後),all the time(一直),by the way(順便說一下),on the way(在路上)等等。這些是常見的