不定冠词常位于名词或名词修饰语前。注意：
a. 位于下列形容词之后：such, what, many, half
I have never seen such an animal.
Many a man is fit for the job.
b. 当名词前的形容词被副词 as, so, too, how, however, enough 修饰时，不定冠词应放在形容词之后：
It is as pleasant a day as I have ever spent.
So short a time.
Too long a distance.
c. quite, rather 与单数名词连用，冠词放在其后。
但当 rather, quite 前仍有形容词，不定冠词放其前后均可。如：quite a lot
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