中考英语不定冠词a/an用法区分以及常考情况
a / an表示“每一”：three times a day
A Mr. Li is waiting for you.
a / an 区分
a useful book / a one-eyed camel / a European village / a uniform / a university
a usual thing
an unusual thing / an hour / an umbrella / an honest boy / an English book
an apple / an eight-year-old boy / an unhappy boy
26个英文字母单独使用时，泛指前an的字母是：Mr. Li has one fox.
例如：There is an "o" in the word "worry".
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