2011年6月英語六級語法：定語從句語法精要英語四級、英語六級考試語法：定語從句
限制和非限制性定語從句： 限制性定語從句是名詞詞組不可缺少的一個組成部分， 去掉了會造成病句或意義不明確; 非限制性定語從句屬于補充說明性質(zhì)， 去掉了不會影響主要意義， 通常用逗號與它的先行詞分開。
The boys who wanted to play football were disappointed when it rained.
The boys， who wanted to play football， were disappointed when it rained.
如果定語從句的先行詞是專有名詞， 或是帶有形容詞性物主代詞（my， his， etc）或形容詞性指示代詞（this， that， etc）作限定詞， 其后的定語從句通常都是非限制性的：
Mary Smith， who is in the corner， wants to meet you.
Her mother， who had long suffered form arthritis， died last night.
All these books， which have been donated by visiting professors， are to be used by the postgraduates.
在非限制性定語從句中只能用who/whom指人， 用which指物，通常不用that替代。
My father， who had been on a visit to America， returned yesterday.
All the books， which had pictures in them， were sent to the little girl.
定語從句的引導(dǎo)詞
that， who， whom： 非限制性定語從句， 如果修飾人， 一般用who， 有時用that （作主語時用who較多）。 如果關(guān)系代詞在從句中作賓語， 就應(yīng)當(dāng)用賓格 whom 或that， 但在大多數(shù)情況下都可以省略掉， 在口語中可用who代替whom.
Here is the man （whom） you’ve been looking for.
He is a man （that） you can safely depend on.
The people （who/that） you were talking to were Swedes.
There are some people here who I want you to meet.
但在介詞后只能用whom：
This is the man to whom I referred.
限制和非限制性定語從句： 限制性定語從句是名詞詞組不可缺少的一個組成部分， 去掉了會造成病句或意義不明確; 非限制性定語從句屬于補充說明性質(zhì)， 去掉了不會影響主要意義， 通常用逗號與它的先行詞分開。
The boys who wanted to play football were disappointed when it rained.
The boys， who wanted to play football， were disappointed when it rained.
如果定語從句的先行詞是專有名詞， 或是帶有形容詞性物主代詞（my， his， etc）或形容詞性指示代詞（this， that， etc）作限定詞， 其后的定語從句通常都是非限制性的：
Mary Smith， who is in the corner， wants to meet you.
Her mother， who had long suffered form arthritis， died last night.
All these books， which have been donated by visiting professors， are to be used by the postgraduates.
在非限制性定語從句中只能用who/whom指人， 用which指物，通常不用that替代。
My father， who had been on a visit to America， returned yesterday.
All the books， which had pictures in them， were sent to the little girl.
定語從句的引導(dǎo)詞
that， who， whom： 非限制性定語從句， 如果修飾人， 一般用who， 有時用that （作主語時用who較多）。 如果關(guān)系代詞在從句中作賓語， 就應(yīng)當(dāng)用賓格 whom 或that， 但在大多數(shù)情況下都可以省略掉， 在口語中可用who代替whom.
Here is the man （whom） you’ve been looking for.
He is a man （that） you can safely depend on.
The people （who/that） you were talking to were Swedes.
There are some people here who I want you to meet.
但在介詞后只能用whom：
This is the man to whom I referred.