1、不定冠詞有a (an)與數詞one 同源,是一個的意思。a用于輔音音素前,一般讀作e,而an則用于元音音素前,一般讀做en。
2、表示一個,意為one;指某人或某物,意為a certain。 A Mr. Ling is waiting for you.
3、代表一類人或物。 A knife is a tool for cutting with. Mr. Smith is an engineer.
4、詞組或成語。 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
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