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第2讲 冠词一、不定冠词(a/an) 规则1：当紧挨着不定冠词的单词的第一个音素为辅音音素时，用a；而当紧挨着不定冠词的单词的第一个音素为元音音素时，用an。 【特别提醒】判断a还是an的依据是其后的词的发音，而不是单纯判断是否元音字母。 a university student, a unique style, a European writer, an honest boy, an x－ray, an 800－metre－long bridge 规则2：“a/an ＋ 可数名词单数”常用来表示泛指。 I only know it was a dog not a cat that bit me. 我只知道是狗咬了我而不是猫。 The boy was very pleased to have caught a fish. 这男孩很高兴抓住了一条鱼。 规则3：序数词前面加不定冠词a/an表示“再一，又一”。 She didn't like the color of the two bags and asked for a third one. 她不喜欢这两个包的颜色，又要了一个。 They have a second house in the country. 他们在乡下还有一间房子。 规则4：在“of ＋ a/an ＋名词单数”结构中，不定冠词a/an表示“同一，相同”，相当于the same。 They are all songs of a type. 它们是同类型的歌曲。 Birds of a feather flock together. | 
