说到非限定性定语从句的讲解，还要分成不同的部分，首先大家要知道就得就是该从句的作用是什么。其实它在句子中是一个独立的成分，不会受到主句的限制，把从句去掉之后，主句仍然是成立的。这也是为什么它会叫做非限定性定语从句。其次，大家要了解该从句的形式：非限制性定语从句与先行词以及主句之间的关系不甚紧密，因而通常要用逗号与主句分隔开。例如：
Have you seen the film Titanic, whose leading actor is world famous?
你看过“泰坦尼克号”这部电影吗?它的男主演可是世界闻名的。
My friend, who has served on the International Olympic Committee all his life, is retiring next month.
我有位朋友，他一辈子服务于国际奥林匹克委员会，下个月就要退休了。
在非限制性定语从句也分成不同的种类，在不同情况下，该从句的使用方法也是不一样的，在考试中经常会考察大家对于该从句不同类型的运用。如果大家不能很好的掌握这些用法，在考试的时候就一定会丢分了，下面就是关于该从句不同类型的'介绍：
(1) who引导的非限制性定语从句
Our guide，who was a French Canadian，was an excellent cook.我们的向导，一个法裔加拿大人，擅长于烹调。
My gardener，who is very pessimistic，says that there will be no apples this year.我家的园丁非常悲观，他说今年将不结苹果。
(2) whom引导的非限制性定语从句
关系代词whom用于指人，在句中作动词宾语和介词宾语，作介词宾语时，介词可位于句末。如：
Peter, whom you met in London, is now back in Paris.彼得现在回巴黎了，你在伦敦见过他。
Mr Smith，from whom I have learned a lot，is a famous scientist.史密斯先生是一位著名的科学家，我从他那儿学了许多东西。
(3) whose引导的非限制性定语从句
whose是关系代词who的所有格形式，在从句中作定语。whose通常指人，也可指动物或无生命的事物。如：
The boy, whose father is an engineer, studies very hard.那位小男孩学习很努力，他的父亲是位工程师。
Above the trees are the mountains whose magnificence the river faithfully reflects on the surface. 在树林的高处是山，其壮丽的景色完全映照在河面上。The play，whose style is rigidly formal，is typical of the period.这剧本是那个时期的典型作品，风格拘谨刻板。
(4) which引导的非限制性定语从句
关系代词which在非限制性定语从句中所指代和修饰的可以是主句中的名词、形容词、短语、其他从句或整个主句，在从句中作主语、动词宾语、介词宾语或表语。
① which指代主句中的名词，被指代的名词包括表示物、婴儿或动物的名词、表示单数意义的集体名词以及表示职业、品格等的名词。如：
These apple trees，which I planted three years ago，have not borne any fruit.这些苹果树是我三年前栽的，还没有结过果实。
She is an artist，which I am not.她是一位艺术家，而我不是。
Water，which is a clear liquid，has many uses.水是一种清澈的液体，有许多用途。
The two policemen were completely trusted，which in fact they were.那两个警察完全受到信任，事实上，也真是如此。
② which指代主句中的形容词。如：
She was very patient towards the children，which her husband seldom was.她对孩子们很耐心，她丈夫却很少这样。
She is always careless，which we should not be. 她总是马虎大意，我们可不应该这样。
③ which指代主句中的某个从句。如：
He said that he had never seen her before，which was not true.他说以前从没见过她，这不是真的。
④ which指代整个主句。如：
In the presence of so many people he was little tense, which was understandable.在那么多人面前他有点紧张，这是可以理解的。
He may have acute appendicitis，in which case he will have to be operated on.他可能得了急性盲肠炎，如果是这样，他就得动手术。
When deeply absorbed in work，which he often was，he would forget all about eating and sleeping. 他经常聚精会神地工作，这时他会废寝忘食。
(5) when引导的非限制性定语从句
关系副词when在非限制性定语从句中作时间状语，指代主句中表示时间的词语。如：
He will put off the picnic until May 1st, when he will be free.他将把郊游推迟到5月1号，那时他将有空。
(6) where引导的非限制性定语从句
关系副词where在非限制性定语从句中作地点状语，指代主句中表示地点的词语。如：
They went to London，where they lived for six months.他们去了伦敦，在那儿呆了六个月的时间。
They reached there yesterday, where a negotiation of sale will be held.他们昨天抵达那里, 有一个关于销售的谈判在那儿举行。
(7) as引导的非限制性定语从句
as引出非限定性定语从句时，代替整个主句，对其进行说明但通常用于像as we allaknow, as it is know, as is know to all, as it is, as is said above, as always mentioned above, as is usual, as is often the case, as is reported in the newspaper等句式中。as在非限定性定语从句中作主语、表语或宾语，且引出的从句位置比较灵活，可位于句首或句末，也可置于主句中间。通常均由逗号将其与主句隔开。as有“正如……， 就像……”之意。 如：
As it known to the United States, Mark Twain is a great American writer.美国人都知道，马克?吐温是一位伟大的美国作家。(as在从句中作主语)
He forgot to bring his pen with him, as was often the case. 他忘了带笔，这是常事。(as在从句中作主语)
He is absorbed in work, as he often was. 他正在全神贯注地工作，他过去经常这样。(as在从句中作表语)
Boy as he was， he was chosen king. 他虽是孩子，却被选为国王。(as在从句中作表语)
as we all know, the earth is round.众所周知，地球是圆的。 (as在从句中作宾语)
The two brothers were satisfied with this decision，as was agreed beforehand.两兄弟对此决定都满意，这项决定在事前都已得到他们的同意。(as在从句中作主语)
Taiwan is，as you know，an inseparable part of China.你知道，台湾是中国不可分割的一部分。(as在从句中作宾语)
(8)“介词+关系代词”引导的非限制性定语从句
在介词后引导非限制性定语从句。关系代词which有时并不代表主句中某一确定的词，而是概括整个主句的意思。介词的选择取决于它与先行词的搭配或与从句中谓语动词的搭配。
They were short of sticks to make frames for the climbing vines，without which the yield would be halved. 他们缺搭葡萄架的杆儿，没有它们产量会减少一半。
They thanked Tom，without whose support they would not have succeeded.这些邻居是北京来的，昨天我被介绍同他们认识了。
(9)“名词/代词+of+which / whom”引导的非限制性定语从句
It now has 20，000 hectares of land，more than two-thirds of which are under cultivation. 现在它拥有两万公顷土地，其中三分之二之多已经耕种。
Light is the fast thing in the world, the speed of which is 300.000 kilometeThere are 30 chairs in the small hall, most of which are new.大厅里有三十把椅子，绝大部分是新的。
he textile mill has over 8，000 workers and staff，eighty per cent of whom are women. 这家纺织厂有8千多职工，女职工占百分之八十。
通过对该从句的讲解，大家可以看出，它的种类真的是非常多，不同的词语引导的从句用法都是不同的，大家要学会区分不同用法所表示的含义。虽然该从句在选择题中考察的非常多，但是大家在阅读题中也会看见这样的从句，所以说，大家学习语法知识并不只是为了语法的题目，它对于大家整个英语水平的提升都是非常有帮助的。除此之外大家还要注意一些非限制性定语从句引导词的特殊情况：
1.非限制性定语从句不可用that引导， 在非限制性定语从句中用who(作主语) / whom(作宾语)指人，用which(作主语 / 宾语)指物， 用whose作定语(指人 / 物)。例如：
The famous basketball star, who tried to make a comeback, attracted a lot of attention.
这位试图打反击的著名篮球明星吸引了众人的关注。
The film, whose director is an old man, is very instructive.
这部电影很有教育意义， 它的导演是位老人。
2.关系代词在非限制性定语从句中作宾语时不可省略，若指人时，只用whom，不用who。例如：
York, which I visited last year, is a nice old city.
我去年访问过的约克是个古老而美丽的城市。
Please give the book to Jessica, whom we met in the hall just now.
请把这本书交给杰西卡，就是刚才我们在大厅里遇到的那位。
3.非限制性定语从句不可用why引导， 需用for which替代why。例如：
None of us accepted the reason he explained, for which he was absent.
我们没有一个人接受他所解释的缺席的理由。
定语从句语法总结
一．几个基本概念1.定语从句的定义：用作定语的从句叫定语从句。
2.先行词：被定语从句所修饰的名词或代词。
3.定语从句的位置：紧跟先行词（名词或代词）之后。
4.引导词：引导定语从句的词（包括关系代词和关系副词）。
（1）关系代词：that/who/whom/which/as
（2）关系副词：when/where/why
5.引导词的位置：位于定语从句之前（先行词之后）。【as除外】
6.引导词的功能（作用）：
（1）连接先行词和定语从句。
（2）在定语从句中充当一定的成分（关系代词充当主语或宾语，关系副词充当状语）。
7.定语从句的类型：
（1）限定性定语从句（主句和定语从句之间无逗号）。
① 直接由引导词引导定语从句
The man who you’re talking to is my friend.
② 由介词+关系代词（whom/which）引导
The man to whom you’re talking is my friend.
I need a pen with which I can write a letter.
=I need a piece of paper on which I can write a letter.
介词的`选用可根据从句中的相关词组确定，该介词通常可以放在关系代词之前，也可放在从句之尾。例如：
The man (who/whom/that) I talked about at the meeting is from Beijing University.
=The man about whom I talked at the meeting is from Beijing University.
The palace (which/that) I often pay a visit to was built in the 17th century.
=The palace to which I often pay a visit was built in the 17th century.
（2）非限定性定语从句（主句和定语从句之间用逗号隔开）。
① 直接由引导词引导定语从句。
② 由介词+关系代词（whom/which）引导。
I live in a house far away from the city, in front of which is a big tree.
There is an apple tree standing at the gate, on which are many apples.
This is the man to whom I gave the book.
③ 由“代词/名词+of+whom/which”或“of which/ whom +名词/代词”(先行词指
人用whom,指物用which)引导。One, some, any, none, all, both, several, many, most, neither, either等词、数词、分数或百分比与of whom或of which连用。
He has five children, two of whom are abroad.
(比较：He has five children, and two of them are abroad.)
We have three books, none of which is/are interesting.
(比较：We have three books, but none of them is/are interesting.)
除why和that不能引导非限定性定语从句外，其余引导词都可以，用法同限定性定语从句一样。但要注意以下区别。
1.在形式上非限定性定语从句与主句有逗号隔开。
2.非限定性定语从句的作用：它只是补充说明先行词的情况，翻译时可译成两个句子。
The engineer, whose leg was badly hurt, was quickly sent to hospital.
（那位工程师被很快送往医院，其腿部受了重伤）
The engineer whose leg was badly hurt was quickly sent to hospital.
（那位腿部受了重伤的工程师被很快送往医院）
3.在非限定性定语从句中，任何引导词都不能省略（包括引导词在此定语从句中充当宾语在内）。指人做主语时只能用who, 做宾语时用whom; [要学习网-中学生最喜欢的学习论坛；网址www.yaoxuexi.cn手机版地址wap.yaoxuexi.cn]
指物做主语，宾语都用which; 关系副词用when或where，也不能省略。
The man, ______ is sitting on the chair, is my father.
The woman, _______ I met yesterday, is my English teacher.
The city, _______ is far away, is very beautiful.
He went to America, ______ his parents live.
He joined the Army yesterday, ______ I left, too.
4.whose引导非限定性定语从句：
The house, whose window faces south, is mine.
=The house, the window of which faces south, is mine.
＝The house, of which the window faces south, is mine.
二.定语从句中关系代词和关系副词的基本用法
1.who/that指人是主格在定语从句中代替先行词，又作定语从句的主语，不能省略。
Do you know the gentleman who/that is sitting there?
2.whom/who/that指人是宾格，在定语从句中代替先行词，又作定语从句的宾语（动宾或介宾）。
① 当作动宾（动词后接宾语）时，关系代词可省略。
Do you know the gentleman (whom/who/that) we met just now?
② 当作介宾（介词后接宾语）时：
介词不提前时，关系代词可省略；
介词提前时，关系代词不可省，即介词＋whom(指人时介词后的关系代词只能用whom)。
The man (whom/who/that) I spoke with is my teacher.
The man with whom I spoke is my teacher.
※注：固定的动词短语（动词+介词）如look for, take care of等不能把动词与介词拆开，既介词不能提至引导词前。
She is the right girl (who/whom/that) we are looking for.
3.whose: 指人或物，是所有格“…的”形式。Whose+n.一起在定语从句中充当主语、宾语（动宾或介宾）即先行词的什么东西怎样了，whose不能省略。。Whose+n. = the +n. + of which/whom= of which/ whom+ the =n.
I didn’t find the desk whose leg was broken. （主语）
He is the student whose pencil I broke yesterday. （动宾）
The boss in whose company I work is very kind. （介宾）
4.which/that 指物，指代先行词且在定语从句中作主语或宾语（动宾或介宾）。
① 当作动宾时，关系代词可省略。
② 当作介宾时：
介词不提前时，关系代词可省略；
介词提前时，关系代词不可省，即介词＋which(指物时介词后的关系代词只能用which)。
The house which/that was destroyed in the earthquake is weak.
The pen (which/that) you found yesterday is mine.
The games (that/which) the young men competed in were difficult.
The games in which the young men competed were difficult.
※注:介词+关系代词即介词+whom/which(先行词指人用whom，指物用which)。
※5.as指人或物，在定语从句中可作主语，宾语，表语或状语，不能省略。主要用于 “the same …as…；such …as…；so …as…；as … as…；as follows”固定结构中，形式固定此时的引导限定性定语从句。要用as代替who(m), which, 或that引导定语从句：
Such people as knew Hill thought he was honest.
Such people as Hill knew thought he was honest.
My hometown is no longer the same as it was.
Here is so big a stone as no one can lift.
The child knows as much as grow-ups (know).
I’d like to have the same books as are used in your school.
He is not such a person as I expected.
He will marry as pretty a girl as he can find.
含有定语从句的名言：
1.He, who knows nothing but pretends to knoweverything, is indeed a good-for-nothing. 不懂装懂,永世饭桶。
2.He that is ill to himself will be good tonobody. 人不自爱，焉能爱人?
3.He laughs best who laughs last. 谁笑在最后, 谁笑得最好。
4.He who makes no mistakes makes nothing. 从不犯错误的人一事无成。
5.He that can read and meditate will not findhis evenings long or life tedious. 会读书思索的人不会感到长夜无聊或生活乏味。
6.He that gains time gains all things. 谁赢得时间，谁就赢得一切。
7.He isthe best general who makes the fewest mistakes. ─Hamilton 错误犯得最少的将军就是最好的'将军。──汉密尔顿
8.He who nothing questions, nothing learns. 什么也不问的人什么也学不到。
9.He that is master of himself will soon bemaster of others. 能自制者方能制人。
10.He that travels far knows much. 行万里者,见多识广。
11.He that cannot ask cannot live. 万事不求人,哪里能生存?
12.Afriend is someone who knows all about you and still loves you. 朋友就是这样的人──他了解你的一切而仍然喜欢你。
13.All is not gold that glitters. 闪闪发光者，未必皆黄金。
14.All’s well that ends well. 结果好就一切都好。
15.Godhelps those who help themselves. 自助者天助。
16.Opportunity & luck always showsappreciation for those who are bold in struggling. 机遇和幸运总是垂青勇于奋斗的人。
17.It is the peculiarity of knowledge that thosewho really thirst for it always get it. 凡真正渴求知识者总能得之，这就是知识的独特之处。
18.Those who make most people happy are thehappiest in the world. ─Karl Marx 能使大多数人幸福的人是世界上最幸福的人。──卡尔·马克思
19.Those who find faults with others often losetheir glamour. ─Gorky 爱找别人阴暗面的人，自己也常常失去魅力。──高尔基
20.He conquers twice, who upon victory overcomeshimself. ─Francis Bacon 在获得胜利之后而能克制自己的人，获得了双重的胜利。 ──弗朗西斯·培根
限制性和非限制性定语从句：
1)定语从句有限制性和非限制性两种。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;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。
例如：
This is the house which we bought last month.
这是我们上个月买的那幢房子。(限制性)
The house, which we bought last month, is very nice.
这幢房子很漂亮，是我们上个月买的。(非限制性)
2)当先行词是专有名词或有物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的。
例如：
Charles Smith, who was my former teacher, retired last year.
查理史密斯去年退休了，他曾经是我的老师。
My house, which I bought last year, has got a lovely garden.
我去年买的那幢房子带着个漂亮的花园。
This novel, which I have read three times, is very touching.
这本小说很动人，我已经读了三遍。
3)非限制性定语从句还能将整个主句作为先行词，对其进行修饰，这时从句谓语动词要用第三人称单数。
例如：
He seems not to have grasped what I meant, which greatly upsets me.
他似乎没抓住我的意思，这使我心烦。
Liquid water changes to vapor, which is called evaporation.
液态水变为蒸汽，这就叫做蒸发。
说明：关系代词that和关系副词why不能引导非限制性定语从句。
