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英语从句大全Ppt

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英语四大从句完整讲解版PPT课件

英语四大从句完整讲解版PPT课件

宾语从句
whether / if引导的宾语从句 特殊疑问词引导的宾语从句
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what, wh-ever 引导的宾语从句
We shall not forget when ( = the time when ) the meeting will open.
She walked up to where (= the place where) he stood.
still a problem. 当it 作形式主语，主语从句放在句末时用 whether 或if 均可。
他是否会来这还令人怀疑.
? It is doubtful __w_h_e_t_h_e_r/_i_f_ he will come
here.
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主语从句
that 引导的主语从句 that 一般不能省
? that 是否可以省略?
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that 引导的表语从句
表语从句
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whether / if引导的表语从句 The problem is whether the meeting will be given.
? 此时的whether 是否可以用if 替换?
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that 引导的表语从句 whether 引导的表语从句
whether or not I don’t care _w_h_e_t_h_er_ or not he comes. whether + to do I don’t know _w_h_e_th_e_r_ to go there.
介词后只能用whether It depends on _w__h_e_th_e_r__ you can do the work
She will give whoever (= anyone who) needs help a warm support.

高一英语名词性从句课件用ppt.ppt

高一英语名词性从句课件用ppt.ppt
2. She wondered if the buses would still be running. 宾语从句
3. The truth is that the fog is too thick for the bus to run that far. 表语从句
4. She sensed that she was being watched by a tall man in a dark coat. 宾语从句
二、时态
1. 如果主句是现在的时态 （包括一般现在时 ， 现在进行时，现在完成时），从句的时态可根 据实际情况而定，（包括一般现在时，一般过 去时，一般将来时，现在完成时等）。
❖I know he lives here . ❖I know he lived here ten years ago . ❖I have heard that he will come tomorrow .
Practice time
if / whether
1. I asked her _i_f_/__w_h_e_t_h_e_r_ she had a bike. 2. We’re worried about __w_h_e_t_h_e_r_ he is safe. 3. I don’t know __w_h_e_t_h_e_r_ he is well or not. 4. I don’t know _w__h_e_th_e_r_ or not he is well. 5. I don’t know _w_h_e_t_h_e_r_/_if_ I should go.
❖ We don’t know _w_h_y____ they didn’t finish the job in time.

英语从句大全-Ppt

英语从句大全-Ppt
Example
The book (that) I borrowed from the library is very interesting
Non restrictive attribute clause
Function
Used to supplement explanatory nouns and provide additional information.
Feature
Removing it will affect the completeness of the sentence.
Example
My brother, who is a doctor, lives in New York
03
Adverbial claims
Advisory clause of time
Object claims are often introduced by positions like "of," "in," or "with." They can also be introduced by relative pronouns like "who," "which," or "that."
The comparative advisory clause "that anyone else in the school" compares her Singing Ability to that of other school members
谢谢观看
reason why he was late
Superior clause of condition

初中英语语法状语从句课件(共45张PPT)

初中英语语法状语从句课件(共45张PPT)

• 3）than 意为“比……更……”； • The boy is taller_than_his_father. (比他的父
亲还高)
4）比较状语从句通常与倍数表达法结合起来运用。
①A +is…times +as+ adj.原级+as +B ②A +is…times+ adj.比较级+than +B ③A +is…times+ the size/length/height/width/depth +of + B ④The size/length/height/width/depth… +of+ A+ is…times of +B
where引导 A句+where+B句 在B句…地方, A句… 在环境污染严重的地方，许多珍稀物种处于灭 绝的边缘。
Many rare animals are on the verge of extinction where environmental pollution is serious.
三、条件状语从句 1. If引导的条件句 2. Unless 3. Once 4. As long as
• 这个数据在下降到1990年的20%之前，它先上 升到1980年的80%
• Before the figure jumped to 20% in 1990, it increased to 80% in 1980.
• 5. A句+since+B句/时间短语 【自从B句…,A句就…】
自从手机发明以来，人们的生活发生了巨大变化。
五、目的状语从句
A句+in order that+B句 A句+so that+B句 【A句…是为了B句…】

英语三大从句讲解ppt课件

英语三大从句讲解ppt课件
病 原 体 侵 入 机体， 消弱机 体防御 机能， 破坏机 体内环 境的相 对稳定 性，且 在一定 部位生 长繁殖 ，引起 不同程 度的病 理生理 过程
v 名词性从句（substantive clauses): 主语从句subject clause、宾语从句 object clause、表语从句 predicative clause、同位语从句 appositive clause.
Everything that we saw in this film was true.
③ everything, something, nothing, all, anything, little, much等不定代词作先行词时 This is the very book that belongs to him. ④ 先行词被the only, the very, the same, the last 修饰时。 Who is the girl that is standing under the tree? Which is the machine that we used last Sunday.
如何选用定语从句的关系词 1.首先分清主句和定语从句 2.确定定语从句的先行词 3.把先行词带回到定语从句中去，看其
在定语从句中做什么语法成分（主语， 宾语，定语或状语） 4.若先行词在从句中做主语、宾语或定 语则选择关系代词，若在从句中做状 语，则选择关系副词。
病 原 体 侵 入 机体， 消弱机 体防御 机能， 破坏机 体内环 境的相 对稳定 性，且 在一定 部位生 长繁殖 ，引起 不同程 度的病 理生理 过程
4.Many people , as you know, are learing foreign languages.

高中英语状语从句课件(共124张PPT)

高中英语状语从句课件(共124张PPT)
Business English Certificate
about BEC, I came to realize that what I learnt was really tiny.
当我了解有关BEC相关的信息后，我才发现自 己所学的简直是九牛一毛。
时间状语从句
since 自从……
We haven’t seen each other since we parted. 我们自从分手以后一直没见过面。 备注：主句常用现在完成时，从句 常用一般过去时。
时间状语从句 as when while
时间状语从句
as 正当…… 一 边……一边…… 随着……
1. 表示某事一发生，另一事立即发生
As the suvn. 出ro现ser,istehe fog disv.a消pp失eared.
n. 任期
As he sets out on his second term,
3. 表示两个动作同时发生。 She sang as soon as she did some washing. Report as soon as anything happens.
do some cleaning do some coo
4. 表示“随着…..”。常指一个行为是 另一个行为的结果，或一种状态随另一 种状态变化。
mistakes.
过不了多久，他就会意识到自己的错误。
时间状语从句
after 在……之后
After you use plastic bags, you mustn’t throw them about.
用过了塑料袋之后，不准到处乱扔。
After I got the relevant information

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.

高中英语名词性从句.ppt.ppt

高中英语名词性从句.ppt.ppt

A. what B. who C. that D which
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which 表疑问，哪一个 who,whom 表疑问，谁 whoever ,whomever---- 无论是谁，不管 是谁。= anyone who those who where when why既可表疑问，也可不表疑 问
I still remember _____ this used to be a quiet village .
Why not try your luck downtown--- that’s ______good jobs are.
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if, whether引导的名词从句
whether 与 if 均为 “ether 引导主语从句,表语从句,同位语从
with your job.
12
2) it做为形式主语和宾语
• ★ ★It’s a pity that you missed the film.
• It makes no difference whether he will attend the meeting or not.
• It is said that the novel has been translated into English.
•
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• 在主语从句、表语从句、同位语从句中，that不 能省略。
• 宾语从句中的连接词that在以下三种情况下不能 省略：
• （1）当that 从句与另一名词性从句并列作宾语 时，第二个that不能省；
19
名词性wh-从句
1）由wh-词引导的名词从句叫做名词性wh-从句。 wh-词包括who, whom, whose, what, which, ---ever 等连接代词和where, when, how, why等连接副词。 连接代词和连接副词在句中既保留自己的疑问含 义、又起连接作用，在从句中充当从句的成分。 连接代词在从句中做主，宾，表语。连接副词在 句中做表，状语。例如： 主语：How the book will sell depends on its author. 宾语：The club will give whoever wins a prize. 表 语 ： My question is who will take over the president.

高中英语名词性从句课件(38张ppt)

高中英语名词性从句课件(38张ppt)
The idea that computers can recognize human voices surprises many people.
(that在从句中不充当任何成份)
The idea （that/which） he gave surprises many people．
(that在从句中作gave 的宾语)
宾语从句须注意
1) 由疑问词引导的从句中, 词序按陈述句 顺序排列。
e.g. I wonder what he is doing. 注意：I wonder what was wrong /the matter
with him. 2)当主句的谓语动词是过去时的时候, 从句的 谓语动词应用相应的过去时。自然规律和客观 真理例外。
4) That在其他名词性从句中均不可省略，只有 在宾语从句中that有时可以省略，但在并列 的宾语从句中第二个that 不可省略。
e.g. He said (that) he would leave and that he would never come back again.
5) 否定的转移 若主句谓语动词为think, consider, suppose, believe, expect, fancy, guess, 等, 其后的宾语 从句若含有否定意义, 一般要把否定词转移到 主句谓语上, 从句谓语用肯定式。 e.g. I /we don’t think this dress fits you Well, does it?
3. 连接代词: what, whatever, who, whoever, whom,whose, which（哪个）： 不仅起到连接一个句子的作用,同时也是从句 的一个组成部分；从句不完整，缺成份。

高中英语语法名词性从句(共32张PPT)

高中英语语法名词性从句(共32张PPT)
一有一无：有词义“是 2 连接词 if/whether 否”；无语法功能
I don’t care if he doesn't come.
I don't care whether he comes.
3 连接代词
which
两有：有词义，“哪一个”； 有语法功能。
I can guess which one you would choose.
We suggested that we (should) go to the cinema.
5. His recommendation that we went there on foot is acceptable.
His recommendation that we (should) go there on foot is acceptable.
名词性从句
从句
形容词性 定语从句
副词性
状语从句 主语从句
限定性 非限定性
九种
名词性
宾语从句 表语从句
同位语从句
名词性从句：一个句子充当主 语，宾语，表语，同位语
名词性从句
主语从句 表语从句 宾语从句
同位语从句
引导名词性从句的引导词
连接代词 who, whom, whose, which, what,
另外还有, no wonder, a good thing, a pity, no surprise等
It is a pity that we can’t go.
It is no surprise that our team has won the game.
(2) It be ＋ 形容词 ＋ 从句
找出下列句子中的错误，并总结出规律：

从句分类专题PPT课件

从句分类专题PPT课件
3 This is the best film that I have ever seen.这是我看过的最好的电影。
4 We talked about the persons and things that we remembered.我们谈起了 我们记得的人和事。
5 He is the only man that I want to see. 他是我唯一想见的人。
③先行词有形容词最高级和序数 词修饰时；
④先行词既指人又指物时；
⑤先行词被the only, the very修 饰时；
⑥句中已经有who或which时；
1 He told me everything that he knows. 他把他知道的一切都告诉我。
2 All the books that you offered have been given out.你拿来的所有的书都发 出去了。
备注
10/26/2019
PREV.
NEXT
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2019/10/26
7
关系词
关 系 which 代 词
先行词 从句成分
例句
备注
whom,
It’s a question which needs which
careful consideration.
和that在从句
物 主语,宾语 那是个需要认真思考的问题。 中做宾语时，
可用 for which
10/26/2019
PREV.
NEXT
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二 定语从句中that与which, who, whom的用法区别
情况
用法说明
例句
只用that的 情况
①先行词为all, everything, anything, nothing, little, much等 不定代词时；

主语从句超全ppt课件

主语从句超全ppt课件

第二讲：主语从句的引导词及各 类主语从句
主语从句在复合句中作句子的主语。 引导主语从句的词有从属连词that, whether, if；连接代词who, whoever, whom, what, whatever, whose, which； 连接副词when, where, how, why等。
surprise/no wonder难怪/good news/a good thing/a question /that… …是事实
It is common knowledge that… …是常识
*_It__is__a__p_it_y__th__a_t_(很遗憾)we lost the match.
句子
简单句 复合句
并列句
形容词性从句 名词性从句 副词性从句
定语从句
主语从句 subject clause
宾语从句 object clause
表语从句 predicative clause
同位语从句 appositive clause
比较状语从句 地点状语从句 时间状语从句 让步状语从句 条件状语从句 目的状语从句 方式状语从句 结果状语从句 原因状语从句
*____I_t _is_r_e_p_o_rt_ed__th_a_t_(据报道)20 people were killed in the accident.
*___It_i_s_s_u_g_g_es_t_e_d_th_a_t__(建议)we should eat more vegetable and do more exercise.
特殊疑问句作主语
• 需要先将疑问句的倒装语序变成陈述句语 序。
Why dinosaurs became extinct is still a mystery.

高中英语定语从句——关系代词引导的定语从句(共57张PPT)

高中英语定语从句——关系代词引导的定语从句(共57张PPT)
to?
• 你想要一个你可以把一切都告诉他的朋友吗？
关系代词的作用
• 1.连接主从句 • 2.代替先行词 • 3.在从句中充当成分
关系代词的选择
①先行词： 人
物
②关系词： who、whom whose that which
1，ቤተ መጻሕፍቲ ባይዱho
The boys are TFboys. The boys are singing. The boys who are singing are TFboys.
The man who is running is Captain Jack.
先行词
关系代词
①先行词：被定语从句修饰的词叫先行词。一般分为人和物。
②关系词：引导定语从句的连接词称为关系词，其中who、 whom,whose,that, which称为关系代词
It was felt in Beijing, which is more than two hundred kilometers away.
extreme.
作主语
The book ( which ) my father read is interesting.
作宾语
Which 先行词是物，在定语从句中做主语或宾语，做宾 语时常可省略。
The apple is mine.
?
The apple which is red is mine.
The apple which is green is yours. The apple which is red is small.
The apple which is green is big.
4. that
I have a friend. The friend likes listening to classical music.

英语中各种从句的引导词 ppt课件

英语中各种从句的引导词 ppt课件
63. Twhheenla/wsthtiilme/easw+e延h续ad性g动re词at （fun表w示a一s _段w_h_时e_n间_ w）e wwehrenv/aissit+in终g 止th性e W动a词te（r P表ar示k.时间点）
1.W__h_e_re_v_e_ryou go, you should do your work well. 2.2. You should have put the bookw_h_e_re__ it had
whoever, whenever,
从 表语从句 wthhaterevewr hether
疑问词
同位语从
句句
that
whether
疑问词
1. I think that it is unnecessary for me to speak louder.
2. His mothwerhias ts,atihsfaietd引w导ith名wh词at he has done. 3. That he wa性s a从ble句to时co的me区m别ade us happy.
7. She didn’t dance so gracefully _a_s__ her sister.
8. In order _t_h_a_t we might see the sunrise, we started for the peak early.
1. Halloween is celebrated on the last night of October, __w_h_e_n__ the air is crisp and snow is not far off.
8. Controls are needed on irrigation systems _b_e_ca_u_s_e_ if the ground becomes too saturated the soil in the garden will be too muddy to allow anyone to work on it until it dries out. __If__ there is too much water constantly, the garden will become a swamp and impossible to cultivate.

中考语法知识点总结之各种从句(共24张PPT)

中考语法知识点总结之各种从句(共24张PPT)

• （1）that指物时一般可与which互换， 但在下列情况下，要用that而不用 which。
a. 先行词有all, everything等不定代词 时，如，
Everything (that) he did is wrong.
• b. 先行词被all, every, no, some, any, little, much等修饰时，如，
I have a lot of books and three of them are in Russian.
• 3、状语从句 在复合句中起状语作用的从句叫做状
语从句。状语从句可分为时间状语、地 点状语、原因状语、目的状语、结果状 语、条件状语、行为方式状语、比较状 语、让步状语等多种。
1.时间状语从句
• 3).由as soon as (一…..就……)引导的时间状语 从句。
2.原因状语从句
• 由because 、since 、as（因为、既然、由 于）引导的原因状语从句。
• Since you have known about that , please tell us what to do .
• 如: He is the very man (that) I'm looking for.
• 只用which的情况 在介词后或在非限定性定语从句中
This is the book about which we have talked a lot.
The book, which he gave me yesterday, is very interesting.
• 3.地点状语从句 • 由wherever（无论在哪儿） 引导的地点状
语从句。
• Wherever he goes , he always brings his pet dog .

英语中各种从句的引导词 PPT

英语中各种从句的引导词 PPT
比较状 than, as…as, not as/so… as, such…as, the 语从句 same as,
• He made such an inspiring speech __th_a_t__ everybody got excited.
• 2.They watched her closelya_s___ a cat watch13es a rat.
• _W_h_a_t_e_v_e_r happens, we shall never lose hope.
• 2W. _h_e_t_h_e_r _ she comes here or we go there, the topic of the discussion will remain unchanged.
whwilee:s而aw/然la而nd；. 虽然/尽管；一会儿；once in a
3w.hWilee were having a meeting _w_h_e_n_ a strange
asm:因an为b/由rok于e；in.尽管；像/如/按照；作为；引导定
4语. 从_A_S句__；tismuechg…oeass;otnh,eit’ssagmeettiansg; wasa…rmaesr and
later.
8
条件状语从句：if, unless, as/so long as, in case, only if, if only, on condition that(条件是）, suppose/supposing that（假如）, provided/providing that （假如）
• You’ll fail the exam _u_n_le_s_syou study hard. • 2. I_f___ you don’t have a good command of

英语从句大全-Ppt

英语从句大全-Ppt

• 考点一：主语从句：主要考查主语从句的引导 词；主句的谓语动词，一般用单数。 • 1）It is well-known that the earth moves around the sun. 众所周知，地球围绕太阳转。 （说明：由连词that引导的主语从句，在大多 数情况下用代词it作形式主语。） • 2）Whether we will hold a party in the open air tomorrow depends on the weather. 我们 明天是否在户外开晚会要视天气而定。（此时 不能用if引导主语从句，只能用whether。） • 3）When the sports meet will be held is not decided. 何时举行运动会还没有决定。 • 4）Which car you will choose to buy makes no difference. • 你决定买哪一辆车都不会有任何区别
• 如： • 1）We heard the news that he had won the game. 我们听到消息他赢得了 比赛。 试比较： • 2）We heard the news that he had told her. 我们听到他对她说的消息。 （定语从句） • 例2中的that从句的作用相当于一个形 容词，其作用是修饰the news；例1中 的that从句的作用相当于一个名词， 是对the news的进一步说明。 • 有时如果主句的谓语动词较短，为保 持句子平衡，避免头重脚轻，同位语 从句也常与要说明的名词分开。例如： Word came that he died yesterday. 消息传来说他昨天死了。
• 考点三：表语从句：be动词或者系动词 后面跟主语补足语。 • 1）The question is whether the book is worth reading at all.（问题是这本书 是否值得一读。） 2）That is why we don't like it. • 考点四：同位语从句 • 同位语从句的特点是由一个抽象名词 +that从句构成，引导词一般是that, 而 且that在从句中不充当任何成分。这些 抽象名词有：news, idea, fact, doubt, evidence, promise, rumor, hope, truth, belief, message等，同位语从句是对抽 象名词进行说明解释。

英语所有从句大全(精选课件)

英语所有从句大全(精选课件)

英语所有从句大全英语从句大全１)表语从句1。

定义:用作表语的从句叫做表语从句。

２．构成:关联词+简单句３.引导表语从句的关联词的种类：（1)从属连词that.如：Thｅｔｒoublｅ is thａｔ I have loｓt hｉs addreｓs。

麻烦是我把他的地址丢了。

...文档交流仅供参考...（２)从属连词whetｈer，as，as ｉｆ.如：He lookｅd ｊust aｓ he had ｌooked ｔen years ｂefor ｅ．他看起来还与十年前一样....文档交流仅供参考...Thｅ quｅstｉoｎ iｓ whether theｙ wiｌｌｂe able to ｈelｐus.问题是他们是否能帮我们。

...文档交流仅供参考...注：从属连词ｉf一般不用来引导表语从句，但as if却可引导表语从句,如:All this ｗas over twｅnty yearｓ aｇｏ，bｕt iｔ’s ａs if it ｗas onｌy ｙesterday．...文档交流仅供参考...这都是20多年前的事了,但宛如昨天一样。

能跟表语从句的谓语动词一般为系动词be，seeｍ,lｏｏk 等.如：It lｏｏked ａs ｉf it waｓｇoing to rａin。

看起来天要下雨了。

（3)连接代词who，whｏm,wｈose，ｗhat，ｗhich,whoｅｖｅr，ｗhａteｖer，whiｃhｅvｅr...文档交流仅供参考...连接副词 wherｅ，wｈen,hoｗ，whｙ。

如：Tｈe ｐrobleｍ is who wｅｃaｎｇｅt to rｅpla ｃｅ hｅｒ.问题是我们能找到谁去替换她呢。

...文档交流仅供参考...Tｈe quesｔioｎis ｈｏw ｈe did it。

问题是他是如何做此事的。

That waｓ whａt shｅdｉd tｈis moｒniｎg oｎ rｅa ｃｈｉｎg tｈe attic。

高中英语三大从句综合复习(共63张PPT)

高中英语三大从句综合复习(共63张PPT)
从句
从句
1. 名词性从句 1）主语从句 2）宾语从句 3）表语从句 4）同位语从句
2. 定语从句 3. 状语从句
主语从句
主语从句是在复合句中充当主语的从句，通 常放在主句谓语动词之前，或由形式主语it 代替，而本身放在句子末尾。 That she was chosen made us very happy. Whether he will come is not clear. It is not important who will go. It is still unknown which team will win the match.
4. it 可以作为形式宾语，而真正的宾语that 从句则放在句尾，特 别是在带复合宾语的句子中。 We heard it that she would get married next month.
5. 后边不能直接跟that 从句的动词 allow, refuse, let, like, cause, force, admire, condemn, celebrate, dislike, love, help, take, forgive, etc. 这类词后可以用不定式或动名词作宾语，但不可以用that引导的 宾语从句。 I admire their winning the match. (√) I admire it that they won the match. (√) I admire that they won the match. (X)
1. 作动词的宾语 (1) 由that引导的宾语从句（that 通常可以省略） I heard that be joined the army. (2) 由what, whether (if) 引导的宾语从句 She did not know what had happened. I wonder whether you can change this note for me. (3) 动词＋间接宾语＋宾语从句 She told me that she would accept my invitation.

初中英语宾语从句课件(共28 张ppt)

初中英语宾语从句课件(共28 张ppt)
want to know i_f_ you are safe and w_h_e_r_e_______ you live now. From the newspaper I know t_h_a__t__ thousands of people died.
Many schools and houses were destroyed .I feel sorry, too. I don’t
knowhims主语v谓语o宾语simplesentence简单句s主语v谓语objectclause宾语从句连词从句主语从句谓语mainsentence主句compoundsentence复合句liuyinglikesenglish从句宾语objectclauseconceptobjectclause在复合句中作宾语的句子通常放在主句谓语动词或介词之后
复合句) I want to know _w__h_e_n____ the train __le_a_v_e_s___. 4. Did Peter come here yesterday? Li Lei wants to know. (改为
含宾语从句的复合句) Li Lei wants to know _i_f/_w_h_e_a? 2. "Does the girl need any help?” he asked me.(变为复合句) He asked me _if_/w__h_e_th__e_r the girl __n__e_e_d_e_d_ some help. 3. When does the train leave? I want to know.(改为含宾语从句的
什么是宾语？
I love you. You love me. I clap for him. You should look at me.
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• 1）It is well-known that the earth moves around the sun. 众所周知，地球围绕太阳转。 （说明：由连词that引导的主语从句，在大多 数情况下用代词it作形式主语。）
• 2）Whether we will hold a party in the open air tomorrow depends on the weather. 我们 明天是否在户外开晚会要视天气而定。（此时 不能用if引导主语从句，只能用whether。）
• 有时如果主句的谓语动词较短，为保 持句子平衡，避免头重脚轻，同位语 从句也常与要说明的名词分开。例如： Word came that he died yesterday. 消息传来说他昨天死了。
• 说明：当名词doubt用在否定句中时， 其后的同位语从句应用that引导；而用 在肯定句或疑问句中时则可以用其他词 来引导。例如：
• 2．形容词性从句（即定语从句）（复 合句考查的重点）
• 定语从句主要用来修饰它前面的先行词 （名词或代词）的从句，所以又称形容 词从句。根据与先行词的关系，定语从 句可分为限制性定语从句和非限制性定 语从句。定语从句主要考查引导定语从 句的关系代词和关系副词；介词＋引导 词以及非限制性定语从句。对于定语从 句，在历年专业四级英语试题中，相对 集中地考查了非限制性定语从句、关系 代词和关系副词的选用、定语从句中的 一致关系以及"介词+关系代词"等知识点。
• 如： • 1）We heard the news that he had
won the game. 我们听到消息他赢得了 比赛。 试比较：
• 2）We heard the news that he had told her. 我们听到他对她说的消息。 （定语从句）
• 例2中的that从句的作用相当于一个形 容词，其作用是修饰the news；例1中 的that从句的作用相当于一个名词， 是对the news的进一步说明。
• 3）When the sports meet will be held is not decided. 何时举行运动会还没有决定。
• 4）Which car you will choose to buy makes no difference.
•
你决定买哪一辆车都不会有任何区别。
• 考点二：宾语从句：主要考查宾语从句if 与whether的用法区别：
名词性从句
• 名词性从句：即从句在整个句中起名词 作用，分别可以作主语、宾语、表语、 同位语等，所以这类从句包括主语从句、 宾语从句、表语从句和同位语从句。名 词性从句侧重考查考生在一定的语言环 境下对英语从句的语序、从句连接词的 运用以及主从句时态的呼应等知识点的 掌握；
• 考点一：主语从句：主要考查主语从句的引导 词；主句的谓语动词，一般用单数。
• 考点一：引导定语从句的引导词有关系代 词（who, whom, which, that, whose）和 关系副词(as, when, where, why)等。但是 当下列情况出现时，对引导词有特殊要求。
• 1） 当先行词是all, everything, nothing, something, little, much时；当先行词被all, no, some, any, every, a few, a little, much, only, very修饰时；当先行词被序数 词或形容词最高级修饰时，或者先行词既 有人又有物时，定语从句的引导词用that。 例如:
• 同位语从句的特点是由一个抽象名词 +that从句构成，引导词一般是that, 而 且that在从句中不充当任何成分。这些 抽象名词有：news, idea, fact, doubt, evidence, promise, rumor, hope, truth, belief, message等，同位语从句是对抽 象名词进行说明解释。
• 考点三：表语从句：be动词或者系动词 后面跟主语补足语。
• 1）The question is whether the book is worth reading at all.（问题是这本书 是否值得一读。） 2）That is why we don't like it.
• 考点四：同位语从句（专业四级英语考 查的重点）
英语从句专四考点归纳
从句定义
• 所谓从句是指从属于主句的句子，由从属连词 连接。由主句和从句构成的复合句，是英语中 比较复杂的句子结构。从句的种类有很多，但 根据其性质和作用可以分为：名词性从句，形 容词性从句（即定语从句），副词性从句（即 状语从句）三大类。从句构成与用法的考查要 点很多，历来是专业四级英语考试试题的热点 与焦点，专业四级英语考试几乎每年都涉及到 对名词性从句、定语从句以及状语从句的考查， 常将并列连接词、从属连词、关系代词、关系 副词放在同一题干中进行考查，故意设置干扰 项，增加试题难度，以考查考生分析交际语境、 理解句子之间的逻辑关系的能力。
• I never have the doubt that you can look after yourself. 我从没有怀疑过你 可以照看好自己。
• Some people have the doubt how such a little boy can lift so heavy a box. 这 么一个小男孩怎么能举起这么重的盒子， 对此人们表示怀疑。
• 1）whether和if常与or not连用， whether和or not 既可合起来使用，也可 分开使用；if和or not只能分开使用。如： He asked whether (if) they would come or not. 他问他们是否该来。 I don't know whether or not they will come. 我不知道他们来不来。
• 2）whether 引导的宾语从句一般是肯定 句，if 引导的宾语从句可以是肯定if you had enough money. 她问你是否有足够的钱。 I don't care if it doesn't rain.我不 在乎是否下雨。（只能用if)