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[正]I bought a dictionary yesterday. The dictionary is very good.
[析]在文章中第一次提到某物时用不定冠词，而第二次提到时用定冠词。
[误]Please turn off lights before you leave.
[正]Please turn off the lights before you leave.
[析]虽然是第一次提到某物但说话双方均知其所指，也应用定冠词。
[误]There are nine planets around a sun.
[正]There are nine planets around the sun.
[析]世上独一无二的天体等名词前应加定冠词，如：the earth, the moon, the sun, the sky, the sea.
[误]I live on a second floor of this building.
[正]I live on the second floor of this building.
[析]在序数词，形容词最高级前要用定冠词。如：He is the oldest in the family.
[误]I want to learn the second language this term.
[正]I want to learn a second language this term.
[析]在序数词的含意不是顺序中的第一第二，而其意在于再学一个，再来一个时，应用a，本句的意思应为：这学期我要学一门第二外语。
[误]Mississippi is one of the longest rivers in the world.
[正]The Mississippi is one of the longest rivers in the world.
[析]在河流名称前应加定冠词，如：the Yellow River(黄河)。
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