【不定冠词有哪些 不定冠词用法有哪些？】1、不定冠词有a (an)与数词one 同源，是一个的意思 。a用于辅音音素前 ， 一般读作e，而an则用于元音音素前 ， 一般读做en 。
2、表示一个，意为one；指某人或某物，意为a certain 。A Mr. Ling is waiting for you.
3、代表一类人或物 。A knife is a tool for cutting with. Mr. Smith is an engineer.
4、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
