冠词的位置
（1）冠词与名词连用，总是置于名词之前；若名词有形容词修饰时，冠词通常置于形容词之前。
The potato is a vegetable ,not a fruit.
In the train,we found an empty third-class carriage.
（2）形容词有so、as、too、how修饰时，不定冠词a须置于形容词之后，名词之前。
It was so warm a day that we decided to go to the sea.
It was too good a chance to be missed. You are happy a couple as I’ve ever seen.
（3）指示代词such和感叹词what总是置于不定冠词a之前。
How ever did you make such a mistake. What a lovely day.
（4）many可置于不定冠词之前，后跟单数名词。
I have heard many a young girl say that.
（5）副词quite和rather可置于不定冠词a之前，也可置于其后。
若副词quite和rather置于其前时，语气较强。
She is quite a particular girl.
She lived in rather a lonely part of the country.
若副词quite和rather置于其前时，语气较弱。
That’s a quite surprising result.He’s a rather hard man.
（6）不定代词all、both和副词double须置于定冠词the之前。
All the birds were asleep.
Both (the) boys were late for dinner.（both后的定冠词常可省去）
（7）half和twice均置于不定冠词a和定冠词the之前。
They’ve only heard half the story.
She paid twice the price for it.
不定冠词的用法：
不定冠词所指的名词为不特定者（泛指）
（1）表示“一”的意思，与数词one相同。 Rome was not built in a day.
（2）表示某类人或事物之一。 She became a skilled seaman
（3）a/an用在单数名词前，强调的是名词的类别，表示一类人或事物，而不是强调数，相当于可数名词复数形式，也相当于不定冠词表示类别，one强调个数。
The fox/A fox/Foxes may grow grey,but never good.狐狸会变老，但不会变好。（谚）
A plane/The plane/Planes is a machine that can fly.
（4）表示“每一”，相当于“per”，用于表示时间、重量、长度等单位词前。
We have three meals a day. |
