He buys cars as expensive as he can afford.
此句应把 expensive 放在 cars 之前:
He buys as expensive cars as he can afford.
本句第一个 as 为作为比较的程度副词,第二个 as 为比较连词。关于 afford 的宾语可有两种理解:
1. 由 as 充当;
2. 空缺 (主从句的比较项是 expensive,连同被它修饰的 cars,一并省去)。
传统语法还会把as he can afford 看作定语从句,as 是关系代词指代 expensive cars ,同时作 afford 的宾语。
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He buys cars as expensive as he can afford.
这里的afford是及物动词,为什么没有宾语呢?
【答】“ as + 形容词 + as ”修饰名词时,应该把名词放在形容词后面。例如:
The srudents got as many books as they needed. 同学们得到了全部所需要的书。(第二个 as 在定语从句中作宾语)(摘自《现代英语语法》p.564)
你的句子 He buys cars as expensive as he can afford. 应该改为:
He buys as expensive cars as he can afford. 这里的 as he can afford 是定语从句,在该从句中, as 充当 afford 的宾语。注意:在定语从句中,作宾语的 that 和 who/whom可以省略,但是作宾语的 as 不能省略。