高考英语语法难点：than引导定语从句（考好大学必备）
than除可做连词、介词外，还可以作关系代词，引导限制性定语从句。
一、than作关系代词只用于表示不等同的比较或先行词被the other修饰时。这时的than既有关系代词的作用,又具有连词的性质。
There are more people present today than are expected.
He smoked fewer cigarettes than were normally available.
You spent more money than was intended to be present.
He is the other man than I want to see. (=He is not the man whom I want to see. )
二、than与比较级连用时一般表示程度或范围。
He has drunk considerably more wine than is good for his health.
他酒喝得很多,已经到了有损健康的程度。
当than后是连系动词+过去分词时，可省略连系动词，只保留过去分词。
We must not have more furniture in our rooms than (is) required for convenience.
They came earlier than (was) expected.
三、than与the other连用时表示一种暗含的否定。
He is the other kind of man than we need.我们不需要他这种人。
再举几个例子，供大家参考。
Never give him more money than is necessary.
不要给他超出需用的钱。
That evening he drank more beer than had been his custom.
那天晚上他啤酒喝得比平常多。
There are more demands than can be satisfied.
需求难以满足。
（段惠彬 原载于《英语学习》1997年第11期）
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