Since 用来说明动作起始时间由刀豆文库小编整理，希望给你工作、学习、生活带来方便，猜你可能喜欢“easyrnp操作使用说明”。
Since 用来说明动作起始时间，for用来说明动作延续时间长度。
I have lived here for more than twenty years.I have lived here since I was born..My aunt has worked in a clinic since 1949.Some new oilfields have been opened up since 1976.I have known Xiao Li since she was a little girl.My brother has been in the Youth League for two years.I have not heard from my uncle for a long time.注意：并非有for 作为时间状语的句子都用现在完成时。I worked here for more than twenty years(我现在已不在这里工作。)I have worked here for many years.(现在我仍在这里工作。)京翰教育小窍门： 当现在完成时+一段时间，这一结构中，我们用下面的公式转化，很容易就能排除非延续动词在完成时中的误使。
1)(对)Tom has studied Ruian for three years.= Tom began to study Ruian three years ago, and is still studying it now.(错)Harry has got married for six years.= Harry began to get married six years ago, and is still getting married now.显然，第二句不对，它应改为 Harry got married six years ago.或 Harry has been married for six years.【文字：大 小】
定语从句在句中做定语，修饰一个名词或代词，被修饰的名词词组或代词即先行词。
定语从句通常
出现在先行词之后，由关系词（关系代词或关系副词）引出。
关系代词有：who, whom, whose, that, which等。
关系副词有：when, where, why等。
18.1 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，在从句中作主语和宾语。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.那人车坏了，大家
都跑过去帮忙。
Please pa 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）
18.2 关系副词引导的定语从句
关系副词可代替的先行词是时间、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、理由的名词后取代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。
18.3 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。I'll 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）I'll 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/关系副词。
例1.Is this museum ___ you visited a few days age?
A.where B.thatC.on whichD.the one
例2.Is this the museum ____ the exhibition was held.A.where B.thatC.on whichD.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.在句1中，所缺部分为宾语，而where, that, on which都不能起到宾语的作用，只有
the one既做了主句的表语，又可做从句的宾语，可以省略关系代词，所以应选D。而句2中, 主、谓、宾俱全，从句部分为句子的状语表地点，既可用副词where，又因 in the museum词组，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做的成分，先行词在从句中做主、定、宾语时，选择关系代词（who, whom, that, which, whose）； 先行词在从句中做状语时，应选择关系副词
（where 地点状语，when 时间状语，why 原因状语）。
18.4 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。
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。【文字：大 小】定语从句
Ⅰ.选择题
1.I've read all the books you gave me.A.which B.them C.what D.that
2.There isn't much I can do.A.what B.which C.that D.how
3.He keeps a record of everything he had seen there.A.he B.that C.which D.what
4.Tell us about the people and the places are different from ours.A.that B.who C.which D.whom
5.Mr John said that Suzhou was the first city he had visited in China.A.that B.where C.which D.what
6.The TV play I watched last night is the best one I have watched thisyear.A.which B.what C.whose D.that
7.Last Sunday they reached Qingdao, a conference was to be held.A.which B.that C.when D.where
8.①Is this the museum you visited the other day?
②Is this museum you visited the other day?
A.that B.where C.in which D.the one
9.I began to work in Beijing in the year New China was founded.A.when B.that C.which D.where
10.This is the very film I've long wished to see.A.which B.that C.who D.whom
11.There is no difficulty can't be overcome in the world.A.that B.which C.who D.what
12.Who is the person is standing at the gate of Beijing Tourism Tower?
A.who B.that C.which D.whom
13.This was the supermarket I bought this kind of tin.A.where B.that C.who D.which
14.The house the capitalist used to live in is now a nursery.A.that B.where C.what D.when
15.This is the last time I shall come here to help you.A.that B.which C.when D.what
16.The house we live is not big.A.in that B.which C.in which D.that
17.My neighburs used to give me a hand in time of trouble, was very kind of them.A.who B.that
C.which D.whom
18.All glitters is not gold.A.that B.which C.／ D.what
19.I now know why Mao imprees everyone who meets him the way he does.A.which B.what C.／ D.now
20.Beijing, is the capital of China,is a beautiful city.A.that B.it C.which D.／
21.She was no longer the woman she was.A.that B.which C.what D.who
22.That's the hotel last year.
