有时可以互换。 He married her,
as/which was natural. 很自然地,
他和她结婚了。 as的特殊用法: (1) as引导的定语从句可以放在句首,
而which则不能。 As is known to us all,
China is developing rapidly. 众所周知,
中国发展迅速。 (2) as表示“正如,
正像”,
而which无此意。 此时,
as从句中常有know,
expect,
happen,
point out,
plan,
suggest等单词或短语。 He came back home late,
as we expected. 正如我们所料,
他回家晚了。 注意: as引导的定语从句常见句式有: as is known to all(众所周知),
as is often the case(经常是这个情形),
as is mentioned above(如上所述),
as is announced(如宣布的那样)。 (3) 当先行词被the same,
such修饰时,
定语从句需用as引导。 It is such a difficult problem as none of us can work out. 这么难的一道题,
我们没人做得出。 He wears the same coat as I do. 他穿着跟我一样的外套。 注意: 当先行词被the same修饰时,
that也可引导定语从句,
但意义有所不同。the same...as指同样或同类的事物;the same...that指同一个事物。 This is the same watch as I lost. 这块表与我丢的那块一样。(不是同一块表) This is the same watch that I lost. 这就是我丢的那块表。(是同一块表) 定语从句的用法较为复杂,高考除了单独考查定语从句知识外,还常常结合句式结构、时态等来综合考查。纵观近几年各地高考试题,不难发现其考点主要包括: 1. 考查关系代词和关系副词的区分。如: that, which和where, when的区分; that, which和why的区分等。
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