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[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.
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