不定冠词

不定冠词

不定冠词的定义

　　(1)表示"一个"，意为one;指某人或某物，意为a certain。

　　A Mr. Ling is waiting for you.

　　(2) 代表一类人或物。

　　A knife is a tool for cutting with.

　　Mr. Smith is an engineer.

　　(3) 词组或成语。

　　a little / a few / a lot of / a type of / a pile / a great many / many a / as a rule / in a hurry / in a minute / in a word / in a short while / after a while / have a cold / have a try / keep an eye on / all of a sudden

　　(4) 不定冠词在句子中最大的语法功能是：用在可数名词的单数形式前表示泛指--表明一类人或事物区别于它类。

　　例：I am a Chinese. 我是(一个)中国人。

　　This is a book. 这是(一本)书。

　　(5)为了读音的方便，在以元音音素开头的可数名词的单数名词前用an而不用a。当我们使用an时，条件有三：①这个名词的读音必须是以元音音素开头--即它的音标的第一个音素是元音，而不是说它是以元音字母开头。②它必须是个可数名词。③它还必须是个单数名词。我们常常见到这类用法：

　　a university 一所大学 an hour 一个小时

　　an orange 一只桔子 an engineer 一位工程师

　　an ordinary man一个普通人

　　an honest person一位诚实的人

　　元音字母有：a，e，i，o，u五个

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