英语学习之不定冠词的用法
英语中的冠词有三种，一种是定冠词(the Definite Article)，另一种是不定冠词(the Indefinite Article)，词(Zero Article)。不定冠词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，而an则用于元音音素前，一般读做。
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 / 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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