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前此说过了定冠词的常见用法，意犹未尽。本文就来谈谈不定冠词（indefinite articles） a/an 的用法。 不定冠词最基本的用途就是用来表示一这概念，如： ① A stitch in time saves nine. ② Jason is an internationally known scholar. 此外，a/an 还有下列 6 种用途： ㈠常和time、measurement等有关的名词连用，以表示每 的概念，如： ③ I teach five days a week. ④ This type of vegetables is sold at one dollar a kilo. ⑤ My car usually runs sixty kilometres an hour. ㈡常和 hundred, thousand, dozen 以及数目及数量连用，如： ⑥ That factory turns out at least a hundred tyres a day. ⑦ Noels monthly salary is a thousand dollars. ⑧ I have a number of sponsored students. ⑨ Mary has a lot of money. ㈢在of / at后面出现，以表示同一类这概念，如： ⑩ Birds of a feather flock together. 11. Please come one at a time. 12. Things of a kind come together, so do people of a mind. ㈣常在rather, quite, many, half, what, such等字后面出现，形成固定用法，如： 13. Tom is rather a fool. | 
