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1
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指一类人或事，相当于a kind of
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A plane is a machine that can fly.
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2
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第一次提及某人某物，非特指
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A boy is waiting for you.
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3
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表示“每一”相当于every，one
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We study eight hours a day.
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4
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表示“相同”相当于the same
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We are nearly of an age.
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5
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用于人名前，表示不认识此人或与某名人有类似性质的人或事
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A Mr. Smith came to visit you when you were out
That boy is rather a Lei Feng.
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6
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用于固定词组中
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A couple of, a bit, once upon a time, in a hurry, have a walk, many a time
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7
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用于quite, rather, many, half, what, such之后
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This room is rather a big one.
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8
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用于so(as, too, how)+形容词之后
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She is as clever a girl as you can wish to meet.
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