限制性定语从句是先行词在意义上不可缺少的定语，
如果去掉，主句的意思就不完整或失去意义。这种从 句和主句关系十分密切， 写时不用逗号分开。
非限制性定语从句和主句关系不很密切，只是对先
行词作些附加说明， 如果去掉，主句的意思仍然清楚。 这种从句， 写时往往逗号分开。
限制性定语从句与非限制性定语从句
• My wife who is in Shanghai will come back next week.
a beautiful flower a tall boy
This is the best film that I have seen.
限制性定语从句和非限制性定语从句：
The man who came here yesterday has come again.
My sister, who is twenty, works in a bank.
(定)Thwe hmoan wants to speak to you.
He is the man who wants to speak to you.
• whom代替人在定语从句中作宾语 • 作宾语时whom可以省略 This is the person. (定)I talked to thewpheormson just now.
• My wife, who is in Shanghai, will come back next week.
非限制性定语从句 限制性定语从句
• 形式上：
• 形式上：
有逗号分开
无逗号
• 意思上：
• 意思上：
去掉后无影响
不能省
This is the best film that I have seen. 先行词
• Don’t expect people to do things. (定)You wouldn’t do twhehitchhings yourself.
Don’t expect people to do things which
you wouldn’t do yourself.
关系副词when, where, why
The Attributive Clause
Proverbs
谁笑到最后谁笑得最好。 All is well that end well.
结局好, 一切都好。 He who laughs last laughs best.
真正的友谊犹如健康的身体, 失去时 方知其可贵。 Friendswhich is seldom know until it is lost.
关系副词 先行词 在从句中的成分 when 时间 时间状语 where 地点 地点状语 why reason 原因状语
w• whheenn可用in/on/at/during + which
代替
I still remember the day. (定)I first met him on twhheidchay.
in twhheicdhictionary. The dictionary is the only placewinhewrheic success comes before work.
关系
This is the best film thaatt I ha词ve seen.
啥时用关系代词啥 时用关系副词 呀！！！
选用关系词，需要看两点：
1.看先行词 2. 看关系词在从句中充当的成分。
做主语，宾语，定语，表语 关系代词
做状语用 关系副词
引导定语从句的关系代词
that which who whom whose
that即指人又指物, 作主语或宾语。 which指物, 作主语或宾语。 who, whom指人, who作主语, whom作宾语。 that, which, whom在定语从句中 作宾语时, 可省去。
who 代替人 在定语从句中作主语或宾语
The man will succeed. He has a positive attitude. The man who has a positive attitude will succeed.
练习：用定语从句连成一个句子
The girl is a singer. (定)Thwehgoirl is sitting in the corner. The girl who is sitting in the corner is a singer.
练习：用定语从句连成一个句子
He is the man.
I still remember the day ownhwenhich I first met him.
where
• where可用in/on/at/to + which代替
The dictionary is the only place. (定)Success comes before work
This is the person whom I talked to just now
This is the person to whom I talked just now
练习：用定语从句连成一个句子
I have many friends. (定)I send postcards to mwyhofrmiends before their birthday. • I have many friends wwhhomo I send postcards to before their birthday. • I have many friends to whom I send postcards before their birthday.
• which指代物,在定语从句中既可作 主语也可作宾语
• 作宾语时which可省略
Thinking is the key. The key opens the doors of the world.
Thinking is the key which opens the doors of the world.