3、先行词:被定语从句修饰的词称为先行词
(1)先行词一般是名词和不定代词,如:some-, any-, every-和no与-boy, -thing的合成词;或all、none、any、some、that、those等代词。数词也可以作先行词,人称代词也同样可作先行词。
(2)先行词与关系词是等量关系。必须注意两点:
①先行词在从句中作主语时,从句谓语动词的数由先行词而定。
This is the place which is worth visiting.
②关系词在从句句子中充当了成分,其意思就是先行词的意义,所以在从句中不能重复其意。
There are many places we can visit(them)in China.