编稿：陈玉莲审稿：梁晓
概念引入：
He is a person who never gives up. 他是个永远不服输的人。
I found him in the woods, where has a well-known tree.
(我是在树林里到他的，那里有一棵很有名的树。)
Our guide,(who was a Frenchman, ) was an excellent cook.
我们的导游是个很优秀的厨师，他是个法国人
She was not on the train which arrived just now。
她没在刚刚到达的那辆车上
语法点拨
什么是定语从句？
修饰主语、宾语、表语的句子就叫做定语从句。引导定语从句的关系词有：
关系代词：who, whom, whose, which, that
关系副词：when, where, why
我们把下面两个句子组合成一个复合句：
1. This is our school.It is beautiful.
→This is our school which is beautiful.
2. This is our school.We study in our school.
→This is our school which we study in.
→限制性从句This is our school in which we study.
→This is our school where we study.
3. Do you know the room?It is made of amber.
→Do you know the room which is made of amber?
4. I have read the newspaper.It carries the important news.
→I have read the newspaper which carries the important news.
从上述定语从句的组合我们可以看出：
先行词和关系词的关系：关系代词实际上是先行词的复指；关系词 whose 实际上是先行词的所有格。
1. A plane is a machinethat can fly.
the machine = that
2. The boy who broke the window is called Wangkai.
the boy =who
3. The boy whose parents are working outside was brought up by his grandfather.
the boy’s =whose
【高清课堂：高一英语语法（二）定语从句（二）356521限制性定语从句和非限制性定语从句】
限制性和非限制性定语从句：
什么是限制性定语从句？
• Anyone should be punished.
Anyone who breaks the rules should be punished.
• 也就是说，如果一个句子去掉定语从句后，主句的意思不是所要表明的意思，那么这个定语从句就是限制性定语从句。
什么是非限制性定语从句？
就是不用限制先行词的定语从句。译成汉语时，主句和从句可以分别翻译，互不影响。最大的特点就是先行词后面有逗号隔开。
• She is good at speaking French, which she learned at school.
• This book was written by Jack, who was here a moment ago.
• I have some friends, some of whom are teachers.
非限制性定语从句的连接词可以用who, whom或whose, which。不用that，也不能省略。
• She had eight children, three of whom became soldiers.
• Their teacher is a Japanese, whose wife is a Chinese.
• My sister, who is a nurse, got married last month.
• China has hundreds of islands, the largest of which is Taiwan.
非限制性定语从句还可以用when或where引起。
• She is going to Shanghai, where she was born.
• We will go home next week, when we won’t be so busy.a
• 除了前面提到的那些连接词以外，在下面两种情况下还可以用as作为定语从句的连接词。
1. 当先行词在从句中做主语或者宾语的时候，同时先行词又被same、so或者such修饰的时候。
非限制性定语从句除了可以修饰词以外, 还可以修饰前面整个句子。
• They invited me to their party, which is very kind of them.
• I was late for school again, which made my teacher very angry.
• A student killed his English teacher, which frightened me very much.
• Such people as you said are not good.
• Let’s discuss only such questions as are interesting to all of us.
• I have the same trouble as you have.
• I feel just the same as you do.
• He is so good a teacher as I like very much.
• Those are so difficult the questions as he asked.
2. 在非限定性定语从句中，as和which可代整个主句，相当于and this或and that。as一般放在句首，which在句中。
• As we know, smoking is harmful to one's health.
• Smoking is harmful to one’s health, which is known to all.
限制性定语从句和非限制性定语从句的区别：
上述定语从句都是我们已经学过的限制性定语从句。所谓限制性定语从句，是指定语从句
部分对先行词起限制、修饰的作用，关系代词有that, which, whom, who, whose以及关系副词when, where, why等，没有逗号把从句与先行词分开。限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确。
Do you know the professor who is speaking at the meeting?
你认识那个正在会上讲话的教授吗？
Where is the book which I bought this morning?
我今天上午买的书在哪儿呢？
此外，还有一类非限制性定语从句，非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开。用法其实与限制性定语从句极为相似，只是不能用that引导。
This letter is from his parents, who are working in Tibet.
这些信来自他的父母，他们在西藏工作。
English is an important subject, which every student should study well.
英语是一门重要的科目，每个学生都应该学好。
This is our headmaster, who I think has something to tell you. 这是我们校长，我认为他有一些重要的事情要告诉你。(校长只有一位)
限定性：对先行词起修饰限制作用
非限定性：对先行词起补充说明作用，先行词与定语从句有逗号隔开.
He returned home safe and sound after a fierce battle, ____ was unexpected.
A. which B. where C. that D. it
1. 从形式上看
限制性定语从句与其先行词紧紧相连之间不用逗号隔开；非限制性定语从句与先行词之间必须用逗号隔开。
Mr. Smith，who came to see me yesterday，is one of my best friends.
昨天来看我的史密斯先生是我的一位好朋友。(非限制性定语从句)
This is the teacher who has taught for 30 years.
这就是那位有30年教龄的老师，你想见的那个人。(限制性定语从句)
2. 从意义上讲
限制性定语从句用来修饰先行词，具有限制作用，两者关系紧凑，如果将其去掉，会影响句子意思的完整性往往句意不明，有时甚至于引起费解、误解；而非限制性定语从句仅仅对先行词作补充性叙述或说明，不起限制作用两者关系不那么紧密，可以省略，省略后主句的意思仍然完整；
Her sister who teaches us English will go abroad next year.
她教我们英语的明年将出国。(限制性定语从句，意思是她可能还有别的。)
Her sister，who teaches us English，will go abroad next year.
她的教我们英语，明年将出国。(非限制性定语从句，对先行词her sister起到补充说明的作用，言外之意：她只有一个。)
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