中考英語知識點：不定冠詞的區(qū)別和用法

　　1.不定冠詞a 和an的用法區(qū)別：a 用在單詞發(fā)輔音開首的單詞前，an用在單詞發(fā)元音開首的單詞前。如：

　　a book, a desk, a pen, a doctor, a house

　　an enemy, an accident, an animal, an egg

　　但注意：an hour, a useful tool

　　2．泛指某人或某事物

　　An old man is sitting on the chair.

　　3．表示one 或every，但概念上沒有它們那樣強(qiáng)烈。當(dāng)表示one的意思時，一般不用two, three等相對比。如：

　　Every elephant has a long nose.

　　Take this medicine three times a day.

　　4．用于某些固定詞組中。

　　a few, a bit, a lot of, in a hurry, at a time, all of a sudden, many a, a little, a couple of, as a matter of fact, in a word, have a good time, do sb. a favor, pay a visit to, in a way, have a word with, make a living, take a pride in, take a walk, a great deal of, catch a cold,

　　5．用在某些抽象名詞前，表示“一種，一類，一場，一陣”等

　　She was caught in a heavy rain.

　　It was a wonderful tea.

　　That is a great disappointment.

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