�、� 在 such 或 so + 形容詞與單數(shù)可數(shù)名詞連用時，不可缺 a (an)。如：
He is such ∧ (an) honest boy that all of us like him.
This is so good ∧ (a) book that I read it again.
�、� 表示“有些”時，little, few前面不可缺少 a。如：
Don’t hurry. There is ∧ (a) little time left.
�、� many 前有 great, good 時，要加 a。如：∧(a) great many people.若 many 后接單數(shù)名詞，中間須有 a (an)。如：Many ∧ (a) man has tried it before.
�、� 一些不可數(shù)名詞前，有形容詞修飾表示“一種(場)等”時，要加 a (an)。如：
It’s ∧ (a) famous Chinese tea.
There was∧ (a) heavy rain last night.
�、� 用專有名詞表示“一個像(叫)……的人”時，用 a (an), 如：
He wished to be ∧ (a) Lei Feng.
∧ (A) Mr Wang called you up just now.
�、蕖靶稳菰~比較級 + of the two…”前必須用 the。如：
He is ∧ (the) better one of the two.
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