特别英语语法精讲：三大从句解析

一、名词性从句

名词性从句在句子中可作名词使用，通常充当主语、宾语或表语。

• 作主语：What he said surprised everyone
• 作宾语：I know where the library is
• 作表语：The answer is that we should cooperate

二、定语从句

由关系代词或关系副词引导，修饰先行词

关系代词	功能	例句
that	指代物或人	The book that you recommended is excellent
which	指代非人事物	This is the car which broke down yesterday
who/whom	指代人	The teacher who inspired me still works here

三、状语从句

表示时间、原因、条件等状语关系

• when：I'll call you when I arrive
• because：She stayed home because she was sick
• if：You can borrow the pen if you return it
• until：We'll wait until the meeting ends

（本文参考《剑桥英语语法》第7版及《牛津高级学习者词典》）