什么是非限定性定语从句?其主要标志和特点是什么?

什么是非限定性定语从句?其主要标志和特点是什么?
什么是非限定性定语从句?其主要标志和特点是什么?

什么是非限定性定语从句?其主要标志和特点是什么?
非限制性定语从句 非限定性定语从句：非限定性定语从句的作用是对所修饰的成分作进一步说明,通常和主句间用逗号隔开,将从句拿掉后其他部分仍可成立
1. which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分 ,that不能用于引导非限制性定语从句
例如:
Her house,which was built a hundred years ago,stood still in the earthquake.(那座房子在地震中依然耸立,它是一百多年前建造的.)
3. 有时as也可用作关系代词
4. 在非限定性定语从句中,用who, whom代表人,用which代表事物.
5.当先行词是专有名词或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.
6.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.
非限制性定语从句只是对主句内容,或先行词的补充、解释或附加说明.主句与先行词或从句之间一般用逗号分开,常常单独翻译.没有它,主句意思仍然完整.引导非限制性定语从句的关系代词有as,which,who, whom,whose等,作定语从句的主语、宾语、表语及定语.关系副词有when,where等,作定语从句的状语.关系代词和关系副词在定语从句中一般不能省.
一、as引导非限制性定语从句时,可以代主句的全部或部分内容.常表说话人关于说话的依据、态度、评论、看法等.有“正如、像”等意思.定语从句可以置主句句首、句中或句末.as后常接expect,know,report,say,see等动词的主、被动语态句.
1． ____is known to everybody,the moon travels round the earth once every month．
A．It B．As C．That D．What
2．Mike,as we expected,attended the meeting．像我们所期望的那样,迈克参加了会议.
3．He wasn't unconsicious,as could be judged from his eyes．他并未失去知觉,这从他的眼神可以判断出来.
二、which引导非限制性定语从句的情况很多.
I．指代主句的全部或部分内容时,常表事实、状态、起因等,有“这就使得、这一点”等意思,常置主句末.主句与定语从句用逗号分开.
1．Dorathy was always speaking highly of her role in the play,of course,madethe others unhappy．
A．who B．which C．this D．what
II．指代先行词有多种情况.定语从句置先行词后面.
1．在“n．／pron．／num．．．．＋prep．＋ which”,“prep．＋which”定语从句里. 1）They talked about a movie,the name of which I've never forgotten．他们谈论过一部电影,我决不会忘记片名.
2）In Sydney the Chinese team got 28 gold medals,16．5 of which were won by women．在悉尼奥运会,中国队夺得了28枚金牌,其中16．5枚是女子夺得的.
3）China has thousands of islands,the largest of which is Taiwan．中国有数千个岛屿,其中最大的是台湾岛.
4）Chaplin went to the states in 1910,by which time he had learnt to dance and act in comedies．卓别林1910年去了美国,那时他已学会跳舞和演喜剧了.
2．表唯一性,或者就是指代先行词的事物时.
The dam,which is the biggest in the world,is 3,830 metres long．大坝长3,830米,是世界上最大的坝.
3．先行词是独一无二的事物时.
The moon,which doesn't give out light itself,is only a satellite of the earth．月球本身不发光,它只是地球的一个卫星.
4．先行词表示类属的事物时.
Football,which is a very interesting game,is played all over the world．足球是一项非常有趣的运动,全世界都踢足球.
5．先行词是专有名词时.
1）Three of the biggest man-made projects in the world are the Great Wall of China,the Pyramids of Egypt and the Aswan High Dam, which is also in Egypt．世界上最大的三项人造工程是中国的长城,埃及的金字塔和阿斯旺高坝,它也在埃及.
2）The Nile,which used to flood every year,now runs more regularly below the dam．尼罗河年年涨洪水,现在比较正常地在大坝下面流过了.
6．先行词是表人的职业、品质、身份等名词,作定语从句的表语时.主句和定语从句之间含有对比的意思.
Mike's brother is a policeman,which he isn't．迈克的哥哥是警察,他可不是.
7．先行词是形容词作定语从句的表语时.主句和定语从句含有对比的意思.
Li Ling is very clever,which Li Long isn't．李玲很聪明,李珑可不是.
8．先行词是集体名词表整体意思时.
My family,which has 35 people,is a large one．我家有35口人,是一个大家庭.
9．先行词是国家名词表地域概念时.
Last year he went to Egypt,which is in Africa．他去年去了埃及,埃及在非洲.
三、as,which是指代主句内容的非限制性定语从句时,表依据、评论与表事实、状态等没有多大差别,又在主句末时,有时可以通用.
1．He is quite pleased,as ／which can be seen from his face．他非常高兴,从他的表情可以看出来.
2．You always work hard,as ／which everyone knows．大家都知道,你一向勤奋学习.
但是,上面两句把定语从句置主句句首时,就只能用as.
3．This elephant is like a snake,as anybody can see．像任何人都能看见那样,这头象像条蛇.
4．Bamboo is hollow,which makes it very light．竹子是空的,这就使得它很轻. 在否定意义的非限制性定语从句里,一般用which引导.
5．He came to my birthday party,which I didn't expect at all．我完全没有想到,他来参加我的生日聚会了.
四、who,whom,whose等引导非限制性定语从句时,指代人的普通名词、专有名词等.表示正是或专指先行词等情况.在定语从句中作主语、宾语、定语等.
1．Bob's father,who worked on the project,spent four years in Egypt．鲍勃的父亲从事这项工程,在埃及度过了四年.
2．Dad,this is Zheng Jie,who I knew in Paris．爸,这是郑杰,我在巴黎认识的. 这一句是用主格who代替宾格 whom.
3．His mother,whom he loved dearly, died in 1818．他非常爱戴他的母亲,她死于 1818年.
4．Mr King,whose legs were badly hurt, was quickly taken to hospital．金先生的腿受了重伤,他很快就被送去住院了.
n．／pron．／num．．．．prep．whom；prep． whom；in whose ＋n．；the ＋n．of whom等引导非限制性的定语从句.
5．He spoke of a pen-friend,the name of whom ／whose name I've never forgotten．他提到过一个笔友,他的名字我从未忘记.
6．About 2,000people,many of whom were Europeans,worked on the project．大约两千人从事过这项工程,其中很多是欧洲人.
7．In his office there are nine clerks,the youngest of whom is Mr Liu．他办公室有9个职员,其中最年轻的是刘先生.
8．I decided to write about Chaplin,one of whose films I had seen several years before．我决定写有关卓别林的文章,他的一部电影我几年前就看过了.
9．We went to hear this famous singer, about whom we had heard many stories．我们去听这个著名的歌唱家演唱.我们已经听说了有关他的很多故事. 品黄黑MYK
10．Mr Pattis,in whose office Ms King was working,was very surprised when he found out her secret．金女士在帕蒂思办公室工作.他发现她的秘密时感到非常惊奇.
五、when,where引导非限制性定语从句时,作定语从句的状语.when ＝and then, where ＝and there.why不引导非限制性定语从句.
1．He was quickly taken to hospital,where a doctor wanted to examine Mr King's legs．金先生很快被送去住院,在那里一个医生要检查他的腿.
2．We will put off the outing until next week,when we won't be so busy．我们把郊游推迟到下个星期,那时我们不会那么忙了.
3．He went to America in 1912,where and when he was noticed by an important film director．他在1912年去了美国,当时他在那里引起了一个重要电影导演的注意.
在prep．where ／when非限制性定语从句里,where ＝there,when ＝then.
4．His head soon appeared out of the second storey windows,from where he could see nothing but trees．他的头很快从第二层楼的一个窗户伸出来了,从那里他只能看见树木.
5．That was in 1929,since when things have been better．那是在1929年,从那时起情况就已经好转了.
6．I went to bed at ten,before when I was reading for an hour．我10点去睡觉,在那时以前我看了1小时的书.
有时候where ／when可以用prep．which替换.
7．The southern states wanted to set up a country of their own,where they would be free to keep black slaves．南方各州要建立一个属于他们自己的国家,在那里他们将自由地保留黑人奴隶.
8．I still remembered January 10,on which ／when he came to see me．我仍然记得1月10日,那一天他来看我了.
练习题：用所给的词语填空.少数可以用多次.
A．as B．which C．who D．whom E．whose F．when G．where H．by which time I．from which J．from whom K．north of which L．some of whom M ．the biggest of which
1．Dick is going to join in the football game,____was agreed at the meeting．
2．My brother had been an engineer,____ was what he wanted to be．
3．He reached Beijing in 1998,____, some time later,he became a professor．
4． ____is said above,the number of the students in our school has increased．
5．Write a letter to a friend,____has some difficulties with his studies．
6．There are four rooms in the house,____ is a drawing room．
7．We will move into the new house next week,____it will be completed．
8．When lost in work,he often was,____he would forget all about eating and sleeping．
9．He is a model worker,____we can learn a lot．
10．They had to delay the sports meet till next week,____the weather will be fine．
11．The workers,____stayed there for two years,came from Africa．
12．The building over there is a hospital,____ is a small river．
13．We shall have to make a decision about Ms King,____story I've just told you．
14．Mr Liu,____I spoke of just now, would go to Australia．
15．The Nile,____electricity is produced,now runs regularly below the dam．
Keys：1．A／B2．B3．G4．A（As）5．C6．M 7．H 8．A 9．J10．F 11．L 12．K 13．E 14．C ／D 15．I
在英语中,为了避免重复,句子中的某些部分经常省略,却给理解增加了困难.在近几年的高考试题中,省略现象也十分常见,其基本要点总结如下：
一、并列句中某些相同成分的省略.
This beeper works well, but that one doesn't (work well).
这个寻呼机工作正常, 但那个就不行.
I study at college and my sister (studies) at high school.
我读大学,我妹妹读高中.
二、在when, while, if, as if, though, until, once, whether, unless等连接的状语从句中, 常省略跟主句相同的主语和be动词.
When (I am) in trouble I always turn to her for help.
当我有困难时总是找她帮助.
The letter is to be left here until (it is) called for. 这封信留在这里待领.
三、有形式主语it的主语从句可省略that.
It is an honor (that) I was invited to your birthday party.
我很荣幸被邀请参加你的生日聚会.
It is the third time (that)I have come to China.这是我第三次来中国.
四、在限制性定语从句中可省略作宾语的关系代词whom, which, that.
That is the naughty boy (whom/that) we talked about last week.
他就是我们上周议论的那个淘气男孩.
Is this the radio (that/which) you bought last Saturday?
这是你上周六买的收音机吗?
五、在direction(方向), way(方式), distance(距离), time(时间), times(倍数)等后面所接的定语从句中常省略that, which, in which.
The direction (in which) we move a body can be changed.
我们移动物体的方向是可以改变的.
The distance (which或that)light travels in one second is 300, 000 kilometers.
光每秒走的距离是30万公里.
六、命令句、惊叹句、部分第一人称的陈述句、部分问句和答句中省略最为常见.
Open the door! 开门!
Why not? 为什么不?
Why so? 为什么这样?
Anybody wishing to go? 谁愿意去啊?
七、用so, not或其它手段来省略上文或问句中的一部分或整个句子.
— Can Emily do this work?埃米莉能做这项工作吗?
— I think so.我想她行.
— Did you know anything about it?这件事你以前知道吗?
— Not until you told me.你告诉了我, 我才知道.
八、在特定的上下文里, 为了避免重复, 作谓语、宾语或宾语补足语的不定式再次出现时, to后的内容常承前省略, 只保留不定式符号 “to”.
I don't go swimming now but I used to.
我现在不去游泳但我过去常去(游泳).
You can't work alone in the lab unless you are allowed to.
除非得到允许, 你不能单独在实验室工作.
注意：不定式to之后的动词是be或助动词have时, 要保留to后的be 或have.如：
China is no longer what it used to be. 中国已今非昔比.
— Have you told Allen about the concert? 你告诉艾伦音乐会的情况了吗?
— Sorry, but I ought to have. 对不起, 我本应该(告诉她的).
九、新闻标题要求简练醒目, 需根据上下文的语境推敲其省略部分.
Boy 14, rescued from cliff face. (A boy of 14 has been rescued from cliff face.)
从峭壁上救下14岁的男孩.
American President to fly to London. (American President is to fly to London.)
美国总统将飞往伦敦.
十、注意在一些固定短语中某些介词的省略.
They are (of) the same age. 他们年龄相同.
There is no use (in) explaining it to her any more.
再向她解释这件事是无用的.
单元交际功能
表示焦虑和担心
How terrible!
太可怕了!
It makes me feel worried.
这让我感到很着急.
It makes my hair stand on end.
这令我毛骨悚然.
It makes me feel uneasy when I see her.
看到她使我感到不自在.
It's a frightening thing to kill so many miners in the accident.
那么多矿工在事故中遇难身亡,真是太可怕了.
I'm really frightened to death to see the snake.
看到蛇我吓得半死.
He got into a total panic when he saw the drowning child.
看到孩子溺水他慌作一团.
I dare not go out alone at night.
晚上我不敢一个人外出.
What's really scary is that the hurricane has caused so many losses.
真正令人恐惧的是飓风造成这么大的损失
限制性定语从句和非限制性定语从句有四大区别,现作简要介绍.
一、在句中作用不同
限制性定语从句对被修饰的先行词有限定制约作用,使该词的含义更具体,更明确.限制性定语从句不能被省略,否则句意就不完整.
非限制性定语从句与先行词关系不十分密切,只是对其作一些附加说明,不起限定制约作用.如果将非限制性定语从句省去,主句的意义仍然完整.
二、外在表现形式不同
限制性定语从句因与先行词关系密切,所以不可以用逗号将其与主句隔开；而非限制性定语从句与先行词关系不十分密切,所以可用逗号将其与主句隔开.
例 1. Do you remember the girl who taught us English?
你还记得教我们英语的那个女孩吗?
例 2. Clock is a kind of instrument which can tell people time.
钟是一种能够告诉人们时间的仪器.
例 3. This is the place where he used to live.
这就是他过去居住的地方.
例 4. Mr. Zhang, who came to see me yesterday, is an old friend of mine.
张先生昨天来看我,他是我的一位朋友.
例 5. We walked down the village street, where they were having market day.
我们沿着村里的大街向前走去,村民们正在那里赶集.
析：在前三个例句中,定语从句与先行词关系密切,为限制性定语从句,不可用逗号将其与主句隔开.在后两个例句中,定语从句与先行词关系不密切,为非限制性定语从句,可用逗号将其与主句隔开.
三、先行词内容有所不同
大多数限制性和非限制性定语从句的先行词往往为某一个词或短语,而特殊情况下非限制性定语从句的先行词也可为整个主句,此时非限制性定语从句常由 which 引导.
例 1. A middle-aged woman killed her husband, which frightened me very much.
一个中年女子杀害了自己的丈夫,这令我十分恐惧.
析：由语境可知,令“我”恐惧的内容应为“中年女子杀害了自己的丈夫”这整个一件事,因此先行词为整个主句,此时应由 which 引导定语从句.
例 2. A five-year-old boy can speak two foreign languages, which surprises all the people present.
一个五岁男孩会讲两门外语,这令所有在场的人感到非常惊讶.
析：由语境可知,令所有在场的人感到惊讶的内容是“一个五岁男孩会讲两门外语”这整个一件事,因此先行词为整个主句,此时应由 which 引导非限制性定语从句.
四、关系词的使用情况有所不同
（一） that 不可用于引导非限制性定语从句
所有关系代词和关系副词均可引导限制性定语从句,大多数关系代词和关系副词可引导非限制性定语从句,但 that 不可.
例 1. 他送给他母亲一台彩电作为生日礼物,这使她非常高兴.
误： He gave his mother a color TV set for her birthday, that pleased her a lot.
正： He gave his mother a color TV set for her birthday, which pleased her a lot.
例 2. 他没通过这次考试,令我很失望.
误： He didn't pass the exam, that disappointed me.
正： He didn't pass the exam, which disappointed me.
值得注意的是,不少同学误认为只有 which 才能引导非限制性定语从句,这个观点是不正确的.使用非限制性定语从句时,如果先行词指人,则用 who , which 或 whose 引导非限制性定语从句；先行词指物可用 which 引导非限制性定语从句；先行词表时间或地点且在从句中作时间状语或地点状语时,可用 when , where 引导非限制性定语从句.
例 1. We'll graduate in July, when we will be free.
我们将于七月份毕业,到那时我们就自由了.
例 2. Last Sunday they reached Nanjing, where a conference was to be held.
他们上周日到达南京,有个会议要在那里举行.
（二）关系代词替代情况不同
关系代词 whom 在限制性定语从句中作宾语时可用 who 代替 whom ,但 whom 在非限制性定语从句中作宾语时不可用 who 来代替.
例 1. This is the girl whom I met in the street.
这是我在街上遇到的那个女孩.
析：先行词 the girl 在限制性定语从句中作宾语,可用 who 代替 whom .
例 2. A young man had a new girl friend, whom he wanted to impress.
一个年轻的小伙子新交了一个女朋友,他想给她留下深刻的印象.
析：先行词 a new girl friend 在非限制性定语从句中作宾语,不可用 who 代替 whom .
在限制性定语从句中,先行词指人时可用 that 代替 who/ whom ,但在非限制性定语从句中先行词指人时,不可用 that 代替 who/whom .
例：她有一个姐姐,她是教师.
误： She has a sister, that is a teacher.
正： She has a sister, who is teacher.
（三）关系代词省略情况不同
关系代词在限制性定语从句中作宾语时可以省去,非限制性定语从句的所有关系词均不可省.
例 1. This is the book （which/that） he lost yesterday.
这就是他昨天丢的那本书.
析：先行词 the book 在限制性定语从句中作宾语,关系代词 which 或 that 可以省略.
例 2. The book, which he lost yesterday, has been found.
他昨天丢了这本书,但现在已找到了.
析：先行词 the book 在非限制性定语从句中作宾语,关系代词 which 不可省.

先百度一下再提问能省多少事啊.....
http://www.baidu.com/s?tn=monline_dg&ie=gb2312&bs=how+long%CA%B2%C3%B4%D2%E2%CB%BC&sr=&z=&cl=3&f=8&wd=%B7%C7%CF%DE%B6%A8%D0%D4%B6%A8%D3%EF%B4%D3%BE%E4&ct=0
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先百度一下再提问能省多少事啊.....
http://www.baidu.com/s?tn=monline_dg&ie=gb2312&bs=how+long%CA%B2%C3%B4%D2%E2%CB%BC&sr=&z=&cl=3&f=8&wd=%B7%C7%CF%DE%B6%A8%D0%D4%B6%A8%D3%EF%B4%D3%BE%E4&ct=0
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非限定性定语从句
非限定性定语从句的作用是对所修饰的成分作进一步说明，通常是引导词和先行词之间用逗号隔开，将从句拿掉后其他部分仍可成立
1. which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分
2. 在引导限定性定语从句时，that有时相当于in which, at which, for which或at which
Attitudes towards daydreaming are changing in much the same way that(in which) attitudes towards night dreaming have changed.
人们对白日做梦的态度正在改变，这与人们对夜间做梦的看法的变化有非常相似之处。
I like the music for the very reason that(for which) he dislike it.
我出于某种原因喜欢这种音乐，而他恰恰与我相反。
We arrived the day that(on which) they left.
刚好我们到的那天他们走了。
3. 有时as也可用作关系代词
4. 在非限定性定语从句中，不能用that，而用who, whom代表人，用which代表事物.
限定性定语从句&非限定性定语从句 的区别
1 限定性定语从句:
不能省略,如果省略整个句子意思不完整
非限定性定语从句:
可以省略,如果省略整个句子意思仍然完整
2 限定性定语从句: 可以用that 引导
非限定性定语从句: 不可以用that 引导
3限定性定语从句: 关联词有时可以省略
非限定性定语从句:关联词不可以省略
4限定性定语从句:不用逗号把它和句子的其他部分隔开
非限定性定语从句:用逗号把它和句子的其他部分隔开
5限定性定语从句: 只能修饰先行词
非限定性定语从句:可以修饰先行词，也可以修饰整个句子或句子的一部分
这两种定语从句在其功能和形式方面都有明显的区别：
限定性定语从句与主句的关系很紧奏，对其先行词起限定、修饰的作用。如果将其去掉，会影响句子意思的完整性；有时甚至于引起费解、误解。例如：
Rainforests are being cleared for valuable timber and other resources to speed up the economic growth of the nationsin which they are located .
为了加速他们各自所在国家的经济发展，热带雨林作为有价值的原木和其他资源正为人们所砍伐。
Ocean currents affect the climates of the lands near which they flow.
洋流影响其流经的附近地区的气候。
They explained the reason to us why they had hated us before.
他们向我们解释为什么他们不喜欢我们的原因。
非限定性定语从句非限定性定语从句在形式上就与主句很松散，它与主句之间有一个逗点"，"隔开；它对其先行词没有限定、修饰的作用，只起补充、说明的作用。有时也用它来对全句进行补充、说明。即使将其去掉，也不会影响句子意思。由于上述原因，非限定性定语从句在表达意思方面也有别于限定性定语从句。另外，非限定性定语从句在中文译文里，我们往往将其作为一个分句处理，而不把它作定语翻译。例如：Earlier , the Babylonians had attempted to map the world , but they presented it in the form of a flattened disc rather than a sphere , which was the form adopted by Ptolemy .
（此句中，非限定性定语从句是对先行词a sphere进行补充、说明。）
更早之前，巴比伦人曾试图绘制世界地图，但是他们把它绘制成平盘状而不是托勒密所采用的球体状。
The combination of satellites, which transmit information , computers , which store information , and television , which displays information , will change every home into an education and entertainment center .
（此句中，三个非限定性定语从句分别对三个先行词：satellites ，computers和television进行补充、说明。如果去掉这三个非限定性定语从句，那么句子可简化为：
The combination of satellites , computers and television will change every home into an education and entertainment center .）卫星能传输信息，计算机能储存信息，电视能显示信息，把这些手段结合起来可以使每个家庭都成为教育娱乐的中心。
The sun heats the earth , which makes it possible for plants to grow .（此句中，非限定性定语从句是对全句进行补充、说明,将全句表达的意思看成"一件事情）。太阳给予大地热，这就使植物的生长成为可能。
The old man has a son , who is in the army .（此句中，非限定性定语从句是对先行词son进行补充、说明。但本句所传达的信息是："这位老人只有一个儿子" 。如果将此句改写成限定性定语从句：
The old man has a son who is in the army . 那位老人有一个在部队工作的儿子。那么，限定性定语从句就要对先行词son进行限定、修饰。这样一来，句子所传达的信息就变成了："这位老人有一个儿子在部队工作，还有其他的儿子在干别的工作"。）那位老人有一个儿子，他在部队工作。
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英语中的定语从句有限制性和非限制性之分。二者在形式上的区别是：限制性定语人句的关系词和先行词之间不用逗号隔开，而非限制性定语从句则有逗号隔开。
限制性定语从句的作用是用来提供必要的信息，以说明定语从句所修饰的先行词的身分或性质，或用来限制先行词所指的范围。若去掉限制性定语从句，则主句部分的含义不明确或意义不完整。如：
I don”t like people. 这句话意思不明确，因此其后边必须加一个限制性定语从句，才能使句义完整。如：
I don”t like people who are never on time.
非限制性定语从句的作用是用来提供附加的而非必要的信息， 只是对先行词作进一步的解释、补充或说明。若去掉此定语从句，整个主句意义很明确，不会引起误解和歧义。如：
My mother, who is 50 this year, lives with me now.
以上句中的定语从句是对它前面的先行名词进行补充说明的，向读者提供附加的信息，不能变为限制性定语从句。如：
My mother who is 50 years now lives with me now.
这句话会让人误解为“我有好几个母亲，目前和我隹在一起的是今年50岁的那位母亲）
在非限制性定语从句中，有一个关系代词不能用，即that, 它在限制性定语从句中既可以指人也可以指物，但在非限制性定语从句中，指人要用who, 指物要用which, 就是不能用that.
其他关系代词的用法相同。如：
The food, which wasn”t in the fridge, all went off.
I know a friend whose brother is a pop singer.
I like the people who I work with.
We are studying sentences which contain adjective clauses.
I'll never forget the day when we first met in the park.

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用which引导的定语从句 主句和从句间有逗号隔开。

常由WHICH引导，并有逗号与主句隔开