［误］This building is an university.
［正］This building is a university.
［析］a用于以辅音音素开始的单词前，而an用于以元音音素开始的单词前，而不是元音字母开头的单词前。university的第一个音素是［j］，所以用a而不要用an。又如：There is a “n” in the word.是错句，应为：There is an “n”in the word.因字母n的发音的第一个音素是元音。要注意的还有hour因其第一个字母h不发音，所以应该用an hour。例如：
I need an hour to finish the work.
It is a useful dictionary.
It is a European country.
I bought a used car.
［误］I need a umbrella because it looks like raining.
［正］I need an umbrella because it looks like raining.
［析］因umbrella的第一个音素是元音，所以应用an.常用的情况有：an old man, an English teacher, an elephant, an idea, an hour ago, an honest boy…。
［误］“Can you help me” “Sorry, I'm in hurry.”
［正］“Can you help me” “Sorry. I'm in a hurry.”
［析］不定冠词的主要用法如下：
1. 用来表示一类人或事物，如：She is a teacher.
2. 指某一类人或事物中的一个，如：An elephant is bigger than a horse.
3. 泛指某一人或事物，如：A man is waiting for you at the school gate.
4. 相当于“one”的概念，如：I just bought a new dictionary.
5. 其主要的难点是用在固定词组中：
如：have a walk/a rest /a look
又如：in a hurry 匆匆忙忙
make a face 作鬼脸
do somebody a favour 帮某人忙
a number of =many
又如：have a good time (玩得好)
have a cold (感冒)
have a headache (头痛)
have a break=have a rest
［误］I bought the dictionary yesterday. A dictionary is very good.
［正］I bought a dictionary yesterday. The dictionary is very good.
［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。
［误］Please turn off lights before you leave.
［正］Please turn off the lights before you leave.
［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。
［误］There are nine planets around a sun.
［正］There are nine planets around the sun.
［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.
［误］I live on a second floor of this building.
［正］I live on the second floor of this building.
［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.
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