The dictionary is very good.Р[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。Р[误]Please turn off lights before you leave.Р[正]Please turn off the lights before you leave.Р[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。Р[误]There are nine s around a sun.Р[正]There are nine s around the sun.Р[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.Р[误]I live on a second floor of this building.Р[正]I live on the second floor of this building.Р[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.Р[误]I want to learn the second language this term.Р[正]I want to learn a second language this term.Р[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。Р[误]Mississippi is one of the longest rivers in the world.Р[正]The Mississippi is one of the longest rivers in the world.Р[析]在河流名称前应加定冠词,如:the Yellow River(黄河)。
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