第1篇：定语从句as的用法课件
定语从句as的用法课件
(一)、 as作连词的用法:
as作连词，常用来连接主句和状语从句。
1.引导时间状语从句，作“当...的时候”解，有“随着...”之意，与while意义相近，强调两个动作同时发生;或某事一发生，另一事立即发生。eg：
He shouted aloud as her ran along.他一边往前跑，一边高声地呼喊。
I was startled as he opened the door.他一开门，我吓了一跳。
as作连词，相当于when。eg;
As a little boy (When he was a little boy)he began to learn to play piano.他小时候就开始学弹钢琴。
2.引导原因状语从句，作“因为，由于”解，与because的用法相近。eg;
I must stop writing now，as I have rather a lot of work to do.我必须停笔了，因为我还有许多工作要做。
3.引导方式状语从句或比较状语从句，作“正如，(如)像”解。例eg：
As in your country，we grow wheat in the north and rice in the south.正如(像)你们国家一样，我们在北方种小麦，在南方种大米。(方式状语从句)
When at Rome，do as Romans do.入乡随俗。(方式状语从句)
4.引导让步状语从句，作“虽然，尽管”解。这时从句常用倒装语序，即把从句中的表语、状语或动词原形放在as之前。eg;
Strange as it may seem，it is true.尽管这事看上去很奇怪，但却是真的。
Try as he might，Tom could not get out of the difficulties.不管怎样努力，汤姆还是摆脱不了困境。
1. 作“在-------期间，当----的时候”引导时间状语从句.注意与 when、 while的用法区别。
时间状语从句：as的用法
1.某事一发生，另一事立即发生
As the sun rose the frog dispersed 太阳一出来雾就消散。
They strolled into the garden as the music ceased. 音乐声一停，他们就走进花园。
2.在某事发生的过程中另一事发生
I heard the murmur of their voices as I crossed the hall.
我走过大厅的时候听到他们在嘀咕什么。(两个动作都是一般时态)
Just as he was speaking there was a loud explosion.
正当他在说话的时候，一声巨响。(从句用进行时态)
3. 两个动作同时发生
He smiled as he passed. 他路过的时候笑了一下。
As she sang, the tears ran down her cheeks. 她一边唱歌，眼泪一边从脸颊淌下。
Helen heard the story as she washed. 海伦一边洗衣服一边听故事。
He saw that she was smiling as she read. 他看到她一边看着书一边笑。
(两个都是延续性动作)
We get wiser as we get older. 我们随着年龄的增长而变得聪明起来。
(随着时间的变化而变化)
①下列情形时,只用as, 而不用when或while。
1) 用于表示同一个人的两种动作交替进行,指一边----一边. 如:
The girl sings as she goes to school.
He looked behind occasionally as he went forward in the forest.
2)表示两个同步发生的动作或行为,意思是随着-----的发展.如:
As time went on / by, she became more and more beautiful .
As children get older, they become more and more interested in everything.
3)表示两个短暂行为或事情几乎同时发生.如:
I watched her as she read the book.
I thought of it just as you opened your mouth.
Just as the flying worm hit her face, she gave a loud cry.
4)接在名词后面表示某一个年龄段时.如:
As a young man, he was active in sports.
②when作“当……的时候”解,可以指较短的(一点)时间,也可指一段时间。如:
When I was at college, I could speak several foreign languages. When the clock struck twelve, I had slept for 2hours.
③while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。如:Work while you work. Play while you play.
2. As =Since 作“既然”、“由于”解,引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由。如:
As he’s been ill for ages, I will help him.
As / Since youre not feeling well, you may stay at home.
As he wasnt ready , we went without him.
3.As =in the way that作“像”、“按照……的方式”解,引导方式状语从句。如:
Do as I told you.
Remember, you must do everything as I do.
4. 用于as--- as或not / so/ as ---- as中, 前一个as是副词, 后一个as是连词, 引导比较状语从句。如:
They helped the old as much as possible.
I dont speak English so/ as well as she does.
5. 表示虽然, 尽管 等, 引导让步状语从句, 常用倒装语序, 模式为:
adj. /adv. / n.+as +主语+谓语+主句。如:
Young as he is, he knows much.
Tired as they were, they walked on.
6. 表示也------一样。
S he is a doctor, as was her husband.
(二)、 as作关系代词,引导定语从句,表示正如,这一点.如:
1. 引导限制性定语从句，用在“such...as”, “the same...as”，“as...as”等结构中，常译作“像...一样的人(或物)”，“凡是...的人(或物)”。
eg： He wished to be such a man as Lei Feng was.他曾希望做一个像雷锋那样的人。
My hometown is no longer the same as it was.我的家乡再也不像过去一样了。
2.引导非限制性定语从句，用来指代它前面的整个句子(即先行句)，意思是“这一点”。这个分句可以位于句首、句中或句末。
eg：As is well known，oceans cover more than 70% of the earth.
我们知道，海洋占地球面积的百分之七十以上。
He is very careful, as we all know.
As is well-known, belongs to China.
另外,当先行词被the same, such等词修饰时,常用as来引导定语从句。如:
Such a clever girl as she can learn anything quickly.
I was reading the same book as he bought yesterday.
(三)、as作介词的用法.
1. 作“如，像”解,表示好像。如:He dressed as a policeman.
They got united as one man.他们团结得像一个人一样。
2. 作“充当，作为”解,表示作为, 当作。如：I found a job as a guide.
As a writer，he was famous.作为作家，他是很有名的。
3.当某人是某身份时。如：As a child , she was sent to abroad.
4.as引导的介词短语大多用作状语,as译为“作为”;少数情况可引起宾语补足语。如:
As a Party member, Ill take the lead in everything. (状语)
She works as a model. (状语)
She has me as one of her best friends.(引起宾语补足语)
(四)、作副词的用法
as作副词，表示程度，意为“同样地”。在“as...as...”，“not as...as...”结构中的`第一个as是副词，作“和/与...(不)一样”解。
e.g. Jack is as tall as his father.杰克和他的父亲一样高。
He doesnt speak English as/so fluently as you.他的英语说得不如你流利
1 表示与------等同。
如：This dress is twice as expensive as that one.
2 像，如等。
如：As before, he remained unmoved.
五)含as的固定词组的用法
1. as soon as作“一…就”解，引导时间状语从句。
eg：As soon as I get to Beijing，Ill write to you.我一到北京，就给你写信。
2.as/so long as作“只要”解，
e.g. As/So long as you study hard，youll make progress.只要你努力，你就会取得进步。
2. as if/though常用来引导方式状语从句，作“好像，仿佛”解。如果从句中讲的是非真实情况，则用虚拟语气。
e.g. She loves the child as if/though he were her own.
她爱这个孩子如同爱自己的孩子。
3. As if/though也可用来引导表语从句，常用在“It appears/looks/seems...+as if/though”句型结构中。
e.g. It appears as if/though it is going to clear up.看起来天要晴了。
It seems as if/though he knew nothing about it.他好像对此事一无所知。4.as to作“关于，至于”解。
e.g. There is no doubt as to his honesty.他的诚实是无可置疑的。
5.as much/many as作“多达...”，“达到...之多”解。
e.g：He can earn as much as 5000 dollars a month.他每月能挣5000美元。
6.so/as far as I know作“就我所知”解，在句中作插入语。
eg： As/So far as I know，he will come here next Monday.
据我所知，他将于下星期一到这里来。
7.as a result，as a result of表示“由于...的结果”。
e.g. She died as a direct result of the accident.她的死是那次事故的直接结果。
8，as well为“也，还”之意。
e.g. Come early，and bring your brother as well.早点来，把你的弟弟也带来。
9.so as to，so...as to若跟动词原形，表示目的或结果。
eg：He studied hard so as to pass the exam.他努力学习以便通过考试。(表示目的)
第2篇：定语从句课件
定语从句课件
定语从句在句中作定语，修饰名词或代词，被修饰的名词词组或代词即先行词，下面是小编为大家收集整理的定语从句课件相关内容，欢迎阅读。
定语从句课件
1. 关系代词引导的定语从句
关系代词所代替的先行词是表示人或物的名词或代词，并在句中充当主语、宾语、定语等成分。关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
1）who, whom, that这些词代替的先行词是表示人的名词或代词，在从句中作主语或宾语。
例如：
Is he the man who/that wants to see you?
他就是你想见的人吗？（who/that在从句中作主语）
He is the man whom/that I saw yesterday.
他就是我昨天见的那个人。（whom/that在从句中作宾语）
2）whose 用来指人或物，（只用作定语，若指物，它还可以同of which互换）。
例如：
They rushed over to help the man whose car had broken down.
那人的车坏了，大家都跑过去帮忙。
Please pass me the book whose (of which) cover is green.
请递给我那本绿皮的书。
3）which, that所代替的先行词是表示事物的名词或代词，在从句中可作主语、宾语等。
例如：
A prosperity which/that had never been seen before appears in the countryside.
农村出现了前所未有的繁荣。（which/that在句中作宾语）
The package (which/that) you are carrying is about to come unwrapped.你拿的包快散了。（which/that在句中作宾语）
2. 关系副词引导的定语从句
关系副词可代替的先行词是表示时间、地点或理由的名词，在从句中作状语。
1）关系副词when, where, why的含义相当于“介词+which”结构，因此常常和“介词+ which”结构交替使用。
例如：
There are occasions when (on which) one must yield.
任何人都有不得不屈服的时候。
Beijing is the place where (in which) I was born.
北京是我的出生地。
Is this the reason why (for which) he refused our offer?
这就是他拒绝我们帮助他的理由吗？
2）that代替关系副词，可以用于表示时间、地点、方式、理由的名词后代替when, where, why和“介+which”引导的定语从句，在口语中that常被省略。
例如：
His father died the year (that/when/in which) he was born.
他父亲在他出生那年逝世了。
He is unlikely to find the place (that/where/in which) he lived forty years ago.他不大可能找到他四十年前居住过的地方。
3. 判断关系代词与关系副词
方法一：用关系代词还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。
例如：
This is the mountain village where I stayed last year.
这是我去年呆过的山村。
Ill never forget the days when I worked together with you.
我永远不会忘记与你共事的日子。
判断改错：
（错）This is the mountain village where I visited last year.
（错）I will never forget the days when I spent in the countryside.
（对）This is the mountain village (which) I visited last year.
（对）Ill never forget the days (which) I spent in the countryside.
习惯上总把表地点或时间的名词与关系副词where, when联系在一起。此两题错在关系词的误用上。
方法二：准确判断先行词在定语从句中的成分（主、谓、宾、定、状），也能正确选择出关系代词或关系副词。
例1. Is this museum ____ you visited a few days ago?
A. where B. that C. on which D. the one
例2. Is this the museum ____ the exhibition was held.
A. where B. that C. on which D. the one
答案：例1 D；例2 A
例1变为肯定句： This museum is ____ you visited a few days ago.
例2变为肯定句： This is the museum ____ the exhibition was held.
在例1中，从句中所缺部分为宾语，而主句中又缺表语，所以只有the one可以作主句的表语，而关系代词作从句的宾语可以省略，所以选D。
而例2中, 主、谓、宾俱全，从句部分为句子的状语表地点，既可用关系副词where，又可用介词in + which引导地点状语。而此题中，介词on用的不对，所以选A。
关系词的选择依据在从句中所作的成分，先行词在从句中作主语、定语、宾语时，选择关系代词（who, whom, that, which, whose）；先行词在从句中作状语时，应选择关系副词（where 地点状语，when 时间状语，why 原因状语）。
4. 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。
5. 介词+关系词
(1) 介词后面的关系词不能省略；
(2) that前不能有介词；
(3) 关系副词when，where，why的含义相当于“介词+which”结构，因此，常常可以和“介词|+which”结构交替使用。
例如：
This is the house where (in which) I lived two years ago.
这是我两年前住过的房子。
Do you remember the day when (on which) you joined our club?
还记得你加入我们俱乐部的那一天吗？
6. as和which引导的非限定性定语从句
由as和which引导的非限定性定语从句，as和which可代整个主句。as一般放在句首，which在句中。
例如：
As we know, smoking is harmful to one’s health.
如我们所知，吸烟有害健康。
The sun heats the earth, which is very important to us.
太阳使地球暖起来，这对我们很重要。
典型例题：
1. Alice received an invitation from her boss, ___ came as a surprise.
A. it B. that C. which D. he
答案：C。此句为which引导的非限定性从句；that不能引导非限制性定语从句；it和he都使后句成为句子，两个独立的句子不能单以逗号连接。
2. It rained hard yesterday, ____ prevented me from going to the park.
A. that B. which C. as D. it
答案：B。as和which在引导非限制性定语从句时，这两个关系代词都指主句所表达的`整个意思，且在定语从句中都可以作主语和宾语。但不同之处主要有两点：
(1) as引导的定语从句可置于句首，而which不可；
(2) as代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which。在本题中，prevent由于是行为动词，所以正确选项应为B。
7. what/whatever; who/whoever; that/what
(1) what = the thing which；whatever = anything。例如：
What you want has been sent here. 你要的东西都送到这里来了。
Whatever you want makes no difference to me. 不管你要什么，跟我没什么关系。
(2) who = the person that；whoever = anyone who。例如：
(错) Who breaks the law will be punished.
(错) Whoever robbed the bank is not clear.
(对) Whoever breaks the law will be punished. 王子犯法，与庶民同罪。
(对) Who robbed the bank is not clear. 谁抢了银行还不清楚。
(3) that和what
当that引导定语从句时，通常用作关系代词，而引导名词性从句时，that是个不充当任何成分的连接词。宾语从句中的that常可省略；what引导名词性从句，用作连接代词，作从句的具体成分，且不能省略。
例如：
I think(that) you will like the stamps. 我想你会喜欢这些邮票的。
What we need is more practice. 我们需要的是更多的实践。
8. 关系代词that的用法
(1) 不用that的情况：
●引导非限定性定语从句时。例如：
The tree, that is four hundred years old, is very famous here.（错）
●介词后不能用that。例如：
We depend on the land from which we get our food. 我们依赖土地获得食物。
We depend on the land that/which we get our food from.
(2) 只能用that作为定语从句的关系代词的情况：
●在不定代词，如anything，nothing，the one，all，much，few，any，little等作先行词时，只用that，不用which。例如：
All that is needed is a supply of oil. 所需的只是供油问题。
●先行词有the only，the very修饰时，只用that。例如：
He is the only person that attended the meeting. 他是唯一参加这个会议的人。
●先行词被序数词或形容词最高级所修饰时，只用that。例如：
This is the most exciting film I have ever seen. 这是我看过的最令人兴奋的电影。
●先行词既有人，又有物时。例如：
They talked of things and persons that they remembered. 他们谈论着他们记得的人和事。
第3篇：课件定语从句
课件定语从句
小编给大家提供课件定语从句，欢迎参考！
关系代词引导的定语从句
关系代词所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。关系代词在定语 从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
1）who, whom, that
这些词代替的'先行词是人的名词或代词，在从句中所起作用如下：
Is he the man who/that wants to see you?
他就是想见你的人吗？（who/that在从句中作主语） He is the man whom/ that I saw yesterday.
他就是我昨天见的那个人。（whom/that在从句中作宾语）
2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换）, 例如：
The
第4篇：定语从句where用法
where引导定语从句时，其先行词一般是表示地点的名词，它在定语从句中作地点状语，此时where相当于at/in/on+which。如：
This zoo is not the only place where the animal can be seen.这个动物园并不是唯一能够看到这种动物的地方。
扩展资料
where引导定语从句的例句
1.She’s got herself into a dangerous situation where she’s likely to lose her life.
她将自己置于了危险的境地，而且很有可能丢掉性命。
2.I miss the place where I lived in my childhood.
我很想念我童年居住过的地方。
3.This is the
第5篇：高一定语从句用法
定语从句（形容词性从句）
在句中修饰名词或代词的从句，因其修饰作用相当于形容词，故称形容词性从句，即通常所说的定语从句。被定语从句修饰的词叫先行词。引导定语从句的有：
1）关系代词： 先行词为人：who, whom, that, whose
先行词为物：which, that, whose
2）关系副词：when, where, why
注意： 关系词起三个作用：①连接先行词和定于从句②替代先行词③在从句中担任成分
what不能引导定语从句。定语从句一般紧跟在先行词后，但有时也被一个短语隔开。
例如：I was the only person in my office who was invited.
1. 关系代词和关系副词的一般用法
1) 关系代词在从句中充当主语、宾语或表语等成分，关系代词充当宾语、表语时
