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.