如果名词不可数,摒弃a,an不留情:名词的复数形式和不可数名词之前不使用冠词,以元音音素开头的词语之前用an,以辅音音素开头的词语之前用a。 如:What beautiful sunshine it is today! (sunshine不可数名词) What a useful book this is useful!(以辅音音素开头) What an old house...