17) 不定冠词a与an的使用
1.a 用在以辅音音素开头的单词前。如:
There is a b in the word book. 单词book中有个字母b。
类似的字母还有:c, d, g, j, k, p, q, t, u, v, w, y, z。
She has a small knife. 她有一把小刀。
2.an 用于以元音音素开头的单词前。如:
There is an i in the word onion. 单词onion中有个字母i。
类似的字母还有:a, e, f, h, l, m, n, o, r, s, x。
Do you have an umbrella? 你有一把雨伞吗?
3.以元音字母开头的单词前面不一定都用an;以辅音字母开头的单词前面也不一定都用a.如:
a useful book
a universe
a one-letter word
an hour
an uncle
an umbrella
an honest person
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