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高中英语 语法 定语从句(关系副词及介词加关系代词引导)课件(共23张PPT)

高中英语 语法 定语从句(关系副词及介词加关系代词引导)课件(共23张PPT)

一、句型转换 1. I shall never forget the day when New China was founded.
I shall never forget the day _o_n__w_h_i_c_h_ New China was founded.
2. Is this the place where that traffic accident occurred?
has
not only built up my body but also shaped
my character. In addition, I have made
some friends
have the same interest
as me. All in all, I think students should
3. There are two buildings, the larger of _w__h_i_ch__ stands nearly a hundred feet high.
4. The English play in _w__h_ic_h__ my students acted at the New Year’s party was a great success.
⑵ The factory __th_a_t__ we visited yesterday is in the west of the city.
⑶ The factory _in__w_h__ic_h_ there are many modern machines is in the
west of the city.
⑶ The colorless gas is called oxygen, _in__w_h_i_c_h_ fires burn much better.

初中英语定语从句课件(共16 张ppt)

初中英语定语从句课件(共16 张ppt)
9
A. which B. they C. those D. what
Dear mother,
1
Thank you for loving me. I can’t find any
word that can describe your love.
Mknootwhewr’hsaDt aI ycaisncdoomfionrgysoouo2. nI’.mBbuut sI ydownit’th
定语从句
The Attributive Clause
定语从句 （Summary）
被定语从句所修饰的词叫先行词，位于从句之前。定语 从句有关系代词that、which、who、whose、whom和 关系副词when 、where、why引导. 定语从句的基本结构为： 先行词 + 关系代/副词 + 句子 1. This is the film (which/that) I saw last
C. /
2. They lived in houses which
A. are
B. were
often old, cold or unsafe. C. was
3. This the classroom
window is broken.
பைடு நூலகம்
1. A. that
B. whose
C. which
4. Even teachers can’t understand some expressions
That is the reason why(= for which） I’m late.
5
1.可以指代什么？ 2.可以作什么成分？ 3.什么时候可省略？
关系 代词

高中英语定语从句 课件(共23张ppt)

高中英语定语从句 课件(共23张ppt)
宾语
8. As many people as were present voted for the plan.
主语
Task2 参照task 1 中的有关内容，填写表格1：确定关系代词 的依据
关系代词 先行词（人、物） 在 从 句 中 所 作 的 成 分 （主语、宾语、定语）
that
人、物
主语、宾语
writing?
Point 2
宜用that不宜用which引导 定语从句的情况
1. 当先行词是all, little (少), few, much, any, everything, anything, nothing, none等不定代词或被这些词修饰时 2. 当先行词既包括人又包括物时 3. 当先行词被the only, the very, the last, the same 等修饰时 4. 当先行词被序数词或形容词最高级修饰时 5. 当主句是以who, which开头的特殊疑问句时
5. I know the person whose house was totally destroyed in the
earthquake.
定语
6. He lives in a house whose windows face south.
定语
7. Here is so big a stone as no one can lift.
holidays in Qingdao?
用that , when, why, where , which填空
1.I want to know the date, __w_h_e__n_you were born. 2.I have forgotten the date _th_a__t/_w_h__ic_h_ you told me. 3.Do you know the reason __w__h_y___ he is absent today? 4.That is the reason __w_h__ic_h_/_t_h_a_t_ I want to know. 5.This is the factory _w__h_e_r_e__ his father works. 6.This is the factory _t_h_a_t_/_w_h_i_c_h_ his father built.

定语从句课件PPT

定语从句课件PPT

详细描述：练习题三是一道综合性较强的题 目，涵盖了定语从句的多个知识点。这道题 目不仅要求学生熟练掌握定语从句的规则， 还需要具备一定的逻辑推理能力。通过这道 题目，学生可以检验自己对定语从句的掌握 程度，发现并纠正自身的语法错误，进一步
提高语言表达能力。
THANKS
感谢观看
关系代词在定语从句中起 到指代先行词的作用，常 用的关系代词有that、 which、who、whose等 。
关系副词
关系副词在定语从句中起 到连接主句和从句的作用 ，常用的关系副词有 when、where、why等。
定语从句的结构
结构
定语从句通常紧跟在所修饰的名 词或代词之后，由关系代词或关 系副词引导，构成主语、谓语、
总结词：表示地点
详细描述：where在定语从句中用作地点状语，修饰表示地点的名词。它指代先 行词并在从句中充当地点状语，用以描述某个特定的地点或场所。
when的用法
总结词：表示时间
详细描述：when在定语从句中用作时间状语，修饰表示时间的名词。它指代先行词并在从句中充当时间状语，用以描述某个 特定的时间点或时间段。
当关系代词在从句中作表语时。 例如：She is not the girl that she used to be.
只能用which的情况
在非限制性定语从句中，只能用which指代物。例如
He has written a letter, which I received three days ago.
02
关系代词的用法
who的用法
总结词
用于指代人
详细描述
在定语从句中，who通常用于指代人，在从句中充当主语或宾语。例如： “The man who won the prize is a scientist.”（获奖的人是一位科学家。）

高中定语从句课件PPT(条理清晰)

高中定语从句课件PPT(条理清晰)
关系词： 用来引导定语从句，为避免先行词的重复出现用来代替先 行词的词。分关系代词和关系副词。
常见关系词：that, which, who, whom, whose, when, where, why, as
先行词与关系词的联系
• 1）"先行词"与"关系词"的内在联系"先行词"与"关 系词"之间实质上是互等、互换的关系。也就是说， 关系词的作用就是将先行词所表达意义"代到"从 句中来起作用。例如：
二：先行词已有序数词或形容词的最高级或the last, the only等作定语时，例如：
This is the most impressive TV theater that has never been put on show before. 这是以前从未上演过的最有感染力的电视剧。
That is the only way that leads to your success . 那是通向你成功的唯一之路。
Do you know the man whom you just spoke to? 错误：I have no idea about the man whom wrote the article.
• 关系代词whose ：用于代替"表示人或物意义"的 先行词，在从句中作定语，往往与它所修饰的名 词一起构成一个名词短语在从句中担当成分。 Whose常表达"某人的、某物的"之意。例如：
• 2）“先行词”的意义决定“关系词”的选择“关 系词”的选择往往是由“先行词”自身表达的意 义，以及它在从句中的语法功能而决定的。例如：
• Some people who are successful language learners often fail in other fields.

定语从句课件绝对经典系列(共30张PPT)

定语从句课件绝对经典系列(共30张PPT)
定语从句由关系代词关系副词来引导，同位语从句由that,有时也用when ,where, whether来引导
That’s my suggestion that the boy should study hard.
There are thousands of stars in the sky that This is the house in which Luxun once lived.
定语从句
知识准备
什么是定语：
用来修饰名词或代词的词、短语、从句。 .
4.定语 修饰和限定名词和代词的词。通常由形容词，代词(多为
形容词性物主代词），数词，介词短语，动词不定式，分词和从 句（定语从句）来担当。
a kind girl, a book on the desk
I have homework to finish. the fallen leaves
This is the car ______ which I can’t go to work.
This is the car ____which the old man was knocked down
This is the car ____which a boy threw a stone.
This is the car ____which we talked .
what=all that
the chemistry lab. the same…as…“和……同样的
Xi hua who I met across in the street a few days ago has gone abroad.
当先行词为专有名词或整个句子是世界上独一无二的名词时，一般用非限定性定语从句修饰。

高中英语语法讲解定语从句课件(共53张PPT)

高中英语语法讲解定语从句课件(共53张PPT)

关系代词的实质
Join the following sentences:
The girl is Mary. We saw her yesterday.
The girl her we saw
yesterday is Mary.
关系代词的实质
Join the following sentences:
1.that 与which
1.This is the best TV _______ that is made in China. that he 2.The first museum _______ visited in China was the History Museum.
先行词被形容词最高级 或序数词修饰时，引导 定语从句多用that 。
引导定语从句用that .
1.that 与which 1.Who that _______ you have ever
know can do it better ?
Who做先行词时， 引导定语从句用 that
1.that 与which
1.Her bag, in ________ which she put all her money, has been stolen. which she 2.This is the ring on ________ spent 1000 dollars. 3.Xiao Wang , with ________ I went whom to the concert, enjoy it very mue is such a lazy man_____ nobody wants to work with______. A. as; him B. that; / C. as; / D. whom; him 2. Mrs. Black took the police back to____ place ____ she witnessed the robbery. A. the same; as B. the same; where C. the same ; that D. as the same; as

定语从句复习课件ppt

定语从句复习课件ppt

( ) 6. Mr. Green told me that he on a trip next Sunday. (通化)
B A. are going B. was going C. will go
D. would going
( ) 7. Our geography teacher told us that Japan
● Which is the book that was stolen by him?
02
先行词是主句的表语或关系代词在定语从句中作表语 ○ 时。 ○ e.g. China is no longer the country (that) it used to be.
三、关系副词where, when, why引导的定语从句 （在从句中作状语）
1. where表示地点，它引导的定语从句修饰表地点的先行词。 e.g. This is the village where he was born. c.f. This is the village (that/which) he visited last year. 2. when表示时间，它引导的定语从句修饰表时间的先行词。 e.g. I’ll never forget the day when I joined the League. c.f. I’ll never forget the day (that/which) we spent together.
A. that
B. which
C. what
D. /
B
( ) 4. We’re talking about Tonny, you met yesterday.
A. with who B. whom
( C ) 5. Is this the very museum last

人教版英语九年级全册定语从句课件 (共21张PPT).ppt

人教版英语九年级全册定语从句课件 (共21张PPT).ppt

形容词作定语
形容词性物主代词 作定语
介词短语作定语
01 什么是定语
定语：对名词或代词起修饰限定作用的词或短语
形容词作定语
形容词性物主代词 作定语
介词短语作定语
前置 定语
后置 定语
o2
什么是定语从句
02 什么是定语从句
This is a dog which likes eating meat.
这是一只喜欢吃肉的狗。
2. 先行词被序数词或形容词最高级修饰时。
place that they visited in London was Big Ben.
3. 先行词被all,every,no, the only, the very, the last等修饰时。
I've read all the books that are not mine. 我已经读了所有那些不属于我的书。
exploration (勘探)
A. where
B. which C.who
3.-What can we do for the left-home children B need help?
- We could help them with their study online on weekends.
定语从句
ATTRIBUTIVE CLAUSE
01.什么是定语
目录 02.什么是定语从句
Contents 03.定语从句的分类 04.限制性定语从句 05.练习
o1
什么是定语
01 什么是定语 句子就像是一棵大树，主语、谓语、宾语（表语）是主干，定语、 状语、补语是修饰语。
一个漂亮的女孩 一个聪明的男孩 红色的苹果

定语从句完整PPT课件

定语从句完整PPT课件
当先行词是all, everybody, nobody, anybody等不定 代词时，如关系代词在从句中当主语，则优先选用who 连接主从句。
Anybody who refused to bow was thrown into prison without trial.
Everybody who were willing to see the film signed their names here.
注意：
1 关系代词和关系副词在定语从句中都要 充当句子成分。
2 当关系代词充当动词和介词的宾语时可省略， 但如果介词提前的话，不可以用that,而且不可 以省略。
3 定语从句中的谓语动词要和先行词保持一致
注意：one of +名词的复数
the only/the just/the very+one of+名词复数。
1. 正在打篮球的男生们来自一年级。
The boys who/that are playing basketball are from Grade One. 2.照顾我姐姐的护士很善良。 The nursewho/that looks after my sister
is kind.
3.我们观看那部戏是由老舍写的茶馆。
Mary lives in the house whose roof is red.
→ Mary lives in the house the roof oபைடு நூலகம் which/of which the roof is red.
1. The student _w_h_o_s_e_father works in the factory is sitting there. 2. I like the rooms _w_h_o_s_e_windows face south. 3.This is the desk _w__h_o_se_legs were broken. 你能用别的方式改写吗？

初中英语定语从句课件(23张)

初中英语定语从句课件(23张)
定语从句的主谓一致问题
are
is
are
plays
who/that在定语从句中做主语时,谓语动词的单复数应与先行词保持一致。
The place ____ interests the children most is the children's palace. A. what B. that C. where D. in which 2. The mountain ____ we visited last summer is the highest mountain in Europe. A. where B. on which C. what D. which 3. This is the park ____ I visited last week. A. which B. when C. what D. where
G
The girl is Zhao Duola.
定语从句
关系代词
Who
先行词
girl
who is smiling
The girl is Duan Chenmeng.
The film star (人) and her film (物) that you have just talked about is well-known.
√ 只用that不用which
3) 领先行词前面有the only, the same, the last, the very时;
√介词后面只能用which
1) 先行词既有人又有物时;
√ 只用that不用which
2) 先行词前面有最高级或序数词修饰时;
① He is the first person that passed the exam.

定语从句专题讲解课件(共53张PPT)

定语从句专题讲解课件(共53张PPT)
3.I don’t like the man. He is smoking. I don’t like the man who is smoking. ____________________________________ 4.Where is the picture? You bought it last week. Where is the picture that you bought last week? _______________________________________
who, whom, whose, that用法区别.
who 作定语从句的主语或宾语.
The man who is speaking at the meeting is a worker.
The man is a worker. 分解 The man is speaking at the meeting. 作主语
2.关系代词who, that, whom引导的定语 从句:
如果先行词是表示人的名词或代词， 关系代词应用who, that (作主语或宾语) whom (作宾语)
who / that 作主语. (不能省) This is the film star. The film star is very popular in China. This is the film star who / that is very popular in China. (作主语) Practise: 1.The boy called Roy. The boy broke the window.
3. 当先行词有the very, the only, the same等修 饰时。 1).That’s the only thing that I can do now. 2).These are the very words that he used.

定语从句专题讲解课件(共53张PPT)

定语从句专题讲解课件(共53张PPT)

【巧学妙记】定语从句的用法 主句型，从句型，两种句子要完整。 从句紧跟先行词，关系词引导要弄清。 定人要用who或whom，定物which当先用。 关系代词用that，定人定物有本领。 when用来定时间，where用来定地点。 关系代词作成分，唯作宾语可省略。
4.Where is the picture? You bought it last week. _W__h_e_re__is_t_h_e_p_i_c_tu_r_e_t_h_a_t_y_o_u_b_o_u_g_h_t_l_a_s_t _w_e_e_k_?_
1.关系代词that, which引导的定语从句:
形容词作定语
Mary is a girl who is beautiful.
句子作定语,修饰girl, 叫做定语从句
I like music that / which I can dance to.
先行词 关系代词 定语从句
I like the singer who is beautiful. I like the movie that is funny. I still remember the first time when I met her.
I like the movie that is exciting . that 修饰先行词movie
The woman is a teacher.The woman lives next door.
The woman who lives next door is a teacher. who修饰先行词woman
3.Do you know the things and persons
that they are talking about? 先行词 被定语从句修饰的词

定语从句(37张PPT)初中英语专项复习课件

定语从句(37张PPT)初中英语专项复习课件
（that 指人，在从句中作主语，稿不定能P省PT略）
稿定PPT，海量素材持续更
② This is all (that) I can tell you. 新（，th上a千t 指款模物板，选在择总从有句一中作宾语，常省略）
款适合你
③ She is the only person(that) I can trust.（that指人，在从句中作宾语，可以省略）
② It is used to record the tickets (which) passengers buy. 稿定PPT
(作宾稿语定，PPT可，以海量省素略材)持续更
新，上千款模板选择总有一
③ He cam款e适la合te你, which we all know.
(作宾语，在非限制性定语从句中不省略)
先行词是物，只能用that的情况：
3.当先行词被序数词、最高级修饰时： This is the first gift that I bought for my mom. This is the most interesting book that I have read.
4.当先行词被the only , the very , the same ,the last 修饰时： He is the only person that passed the exam in his class.
知识点2：关系代词that /which/who /whom/whose的用法
who和 whom指人, who在定语从句中作主语; whom在定语从句中作宾语, 在限制
性定语从句中不可省略。
The boy who is playing football is my classmate.

初中定语从句完整版PPT精品课件

初中定语从句完整版PPT精品课件
初中定语从句完整版（共32张PPT）
初中定语从句完整版（共32张PPT）
Choose the right answer：
1.The letter _D____I received from him yesterday is very important. A.who B. where C.what D. that
1.先行词为all，everything，nothing ，something，anything，little，much等不定代词
I’ve read all the books that are not mine. You can take any seat that is free.
2.先行词被all，every，no ，some，any，little，much 等修饰时
4.The coat _D____he is wearing today was bought by his aunt. A.what B. where C.who D./
初中定语从句完整版（共32张PPT）
初中定语从句完整版（共32张PPT）
Choose the right answer：
2.Is there anything else __________you require?
3.This is the question_A____we are talking about now. A.that B. who C.where D.when
4.I like the teacher__D____classes are very interesting and creative. A.which B.who C.what D.whose
先行词
关系词

高中定语从句ppt课件

高中定语从句ppt课件

先行词是all, much, something, one
总结词
当先行词是 "all","much","something","one"等表示 泛指或总称的词汇时，从句的引导词通 常使用that。
Hale Waihona Puke VS详细描述例如，在句子"All that glitters is not gold."中，先行词"all"表示泛指，因此从 句的引导词使用了"that"。
先行词被形容词最高级，only, last, just修饰时，引导词用that。
先行词在从句中作补语时，引导 词用that。
先行词为all, much, something, nothing, this, that时，引导词用 that。
先行词既有人又有物时，引导词 用that。
先行词是序数词或被序数词修饰 时，引导词用that。
影响句子的完整性。
用法
通常用逗号与主句隔开，用关系代 词（which、whom、whose等） 或关系副词（when、where、 why等）引导。
例句
My sister, who is a doctor, often works late at night.（我的姐姐是 一名医生，经常工作到深夜。）
which的用法
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在非限定定语从句中，先行词 指人时，引导词用who或 which。指物时，引导词用 which。
在限定定语从句中，先行词指 人时，引导词用that或who。
指物时，引导词用which。
在从句中缺主语、宾语、表语 或定语时，引导词用which。

定语从句课件

定语从句课件
• We interviewed 14 applicants for the post, none of whom we thought suitable.
• John often plays in a group of five children, three of whom he likes very much.
as is said above as is often the case as is reported in the newspaper
8. 准关系代词as
• 非限制性定语从句中which和as的区别 ① which引导的从句不能放在句首
– As is often the case, he is absent. – He saw the girl, as/which he had hoped.
8. 准关系代词as
③ as引导非限制性定语从句
– As we all know, he studies very hard. – As is known to all, he is the best student in our
class. – He opposed the idea, as could be expected.
① such … as
– I’ve never seen such a clever man as he is. – They talked in such simple English as children
could understand. – They talked in such simple English that children
1. 由who, whom, whose引导
• This is the man who helped me. • The doctor (whom) you are looking for is in
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先行词关系词在从句中充当成分主语宾语（可省）定语状语地点时间原因方式指人whothatwhomwhothatwhoseof whom指物whichthataswhichthataswhoseof whichwhere介词+ whichwhen介词+whichwhy介词+whichthatin which省略在定语从句中，当先行词指物时，下列情况的关系词宜用that而不用which:§（1）先行词被①形容词最高级②序数词③数词几种词修饰或被④only、any、few、little、no、all、one of等修饰时。

（2）先行词为all、much、little、none、few、one、something、anything等不定代词时。

（3）先行词中既有人又有物时。

He was looking pleasantly at te children and parcels that filled his bus.（4）先行词在主句中作表语关系词在从句中作表语时。

The village is no longer the one that was 5 years ago.（5）当主句中含有疑问词which时。

Which are the books that you bought for me ?宜用which而不用that的情况§（1）在非限制性定语从句中（2）在关系词前有介词时（3）当先行词本身是that时（4）当关系词离先行词较远时关系词who与that指人时，也有不同情况分别用不同的关系词§（1）当主句是there be句型时，关系词用who。

（2）先行词是为anyone、those、someone、everyone、one等词时，关系词用who。

（3）当主句是who作疑问词时，关系词用that。

Who is that girl that is standing by the window?（4）whom在从句中只作宾语，可被who取代。

§whose作关系词既指人又指物，在从句中作定语。

如：Do you know Mr.Smith whose story is very moving ?There is a room, whose window faces the river.There is a room, the window of which faces the river.关系代词as,在从句中作主语、宾语和表语。

§（1）关系代词常出现在the same…as, such…as, so…as, as…as 等结构中This is not such a book as I expected.I live in the same building as he (lives in).Here is so big a stone as no man can lift.As many children as came here were my father’s pupils.★the same…that…和the same…as…的区别I have bought the same watch as you have.我买了一块和你一样的手表。

（我的手表和你的手表很像，但不是同一块。

）This is the same watch that I lost.这就是我丢的那块手表。

（这手表和我丢的手表是同一块）§（2）as引导非限制性定语从句，指代逗号前的整个句子（即先行词），可置于句首或句末。

This elephant is like a snake, as anybody can see.Mary was late for school, as often happened.As is known to all, the earth is round.★as 指代一句话和which 指代一句话的用法区别which则不需要，例如：The man died last night, which is a lie.as 替代一句话即可放句首也可放句末，而which只能放句末。

1）先行词被such和the same 修饰，或句型as many（much）中，从句都用as 引导。

Such books as you bought are useful.The school is just the same as it was 10 years age.注意：区别①such …that …引导的结果状语从句。

They are suchlovely children that we love them much.§②the same …that …引导定语从句。

I want to use the same tool that you used just now§（2）无先行词的定语从句用as和which引导。

区别：①意义上：as 含有“这点正如……一样”。

②位置上：as 从句可置句首，也可在另处。

He didn’t pass the exam, as we had expected.There is lots of air in loose snow, which can keep the cold out.As is known, the earth is round, not flat.关系副词when与where、why, how, that (非正式)§when 指时间= in / at / on / during whichwhere指地点= in / at / from / whichwhy指原因= for which§How指方式= by which当先行词为way、day、reason、time时，可用that作关系副词。

（非正式场合）I don’t like the way that / in which / he talks.§that可以用于表示时间、地点、方式、理由的名词后取代when, where, why和"介词+ 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.当time作先行词时，关系词可以省掉。

This is the first time I have given you a lesson in French.必须注意的问题§（1）、关系代词在定语从句中主语，其谓语动词与先行词保持一致。

例如：The boy who is standing at the door is my son.§在one of the +复数名词+定语从句结构中，复数名词是先行词，关系代词在定语从句中作主语，其谓语动词用复数形式。

例如：This is one of the best books that have ever been written on the subject.§在“the only one of the +复数名词+定语从句”结构中，one 是先行词，关系代词在定语从句中作主语，其谓语动词用单数。

例如：This is the only one of the best books that has ever been written on the subject.区别定语从句与强调句§①定语从句中关系词作从句成分，复合句。

②强调it无意义，that / who不是引导词。

③强调it is / was和that / who后如果句子意思讲得通则是强调句，讲不通则不是。

It is the museum that is near school.(定语从句)It was in the hotel that we stayed last night.（强调句）§——He was nearly drowned once.——When was _______?——____ was in 1998 ______he was in middle school.A. that; It; whenB. this; This; whenC. this; It; thatD. that; It; that[简析]：本题答案为A。

由于定语从句的干扰作用，相当一部分考生选了D。

这样就成了It was in 1998 that he was in middle school.这样就成了一个强调句型，意为“是在1998年他上的中学”，孤立地看本句虽成立，但联系上下文来看，却属“所问非所答”。

因为上文问的是“他何时差点每被淹死？”而非“何时上的中学”。

原来when是关系副词，引导定语从句，修饰1998。

定语从句when he was in middle school 干扰了强调句型中的that结构。

定语从句与同位语从句的区别§定语从句与前面的名词是修饰与被修饰的关系“。

的（名词）”。

而同位语从句是用来说明前面名词的内容。

与that从句同位的名词必须是一些表事实或概念的抽象名词，如fact, news, belief, truth, reply等。

that在定语从句中作成分，可用which 或who/whom代替；而that 在同位语从句中不充当任何句子成分，只起连接作用。

Word came that their army was defeated.(同位语)We expressed to them our wish that was the same as their.(定语)§We all have heard the news that our team won. (同位语从句，that从句表示news的内容，that 在从句中不作任何成分)We don’t believe the news that/which he told us yesterday.定语从句与状语从句§①He left the key where he had been an hour before.(where引导地点状语从句，相当于in the place where)②He left the place where he lived for many years.(where 引导定语从句，修饰the place)③He is such a good teacher as all of us love and respect.(as 引导定语从句)④He is such a good teacher that we all like him.(that引导结果状语从句,such…that…“如此…以致…”定语从句与主语从句§①As is known to us all, paper was first made in China.(as 引导定语从句，指代整个主句内容，可置于句首)②It is known to us all that paper was first made in China.(it 做形式主语，代替that 引导的主语从句)关系词在从句中省略的情况§①关系词作宾语，前无介词时。