必修三unit3宾语从句
人教版高一英语必修三 unit3 Grammar 名词性从句-宾语从句和表语从句课件
人教版高一英语必修 三 unit3 Grammar 名 词性从句-宾语从句和
My mother told me the sun ____ from the east. Tom asked me why KFC _____ its price again. (raise, rise)
rises raised
注意
用whether而不用if引导宾语从句情况
(whether/if 在宾从中不作成分, 表示“是否”,有时可互换) 1）介词+whether 3）whether to do
介词+宾语从句
l I lived in what you call “Ancient Greece”.
summary
介词 + whether + 陈述句 介词 + wh-词 + 陈述句
注意注意
l 宾语从句的时态必须与主句呼应： 1）主句—现在或将来时态，宾从—根据需要使用任何时态 2）主句—过去时态, 宾从—过去时态 【例外】: 主句—过去时态，宾从—一般现在时态 (宾从表示的是客观事实、自然现象或真理时)
My suggestion is that we (should) go and help him. 我的建议是我们去帮助他。
• 1.The trouble is ______ I have lost his addrtehsast . • 2.The reason ____ he was late was ____ he missed the first bus this morning. • 3.His proposal was that we _________ (collect)all the related information.
必修三unit3宾语从句和表语从句p
5.语序问题
(1) They want to know B _____ do to help us. A. what can they B. what they can C. how they can D. how can they (2) Can you make sure _____ the gold ring? C A. where Alice had put B. where had Alice put C. where Alice has put D. where has Alice put D (3) Someone is ringing Mary. Go and see _____. A. who is he B. who he is C. who is it D. who it is
3.在demand，order，suggest，insist, desire, request, command等表示要求、命 令、建议、决定等意义的动词后，宾语 从句常用“（should）+ 动词原形”。例 如： • I insist that she (should) do her work alone. 我坚持要她自己工作。 • The commander ordered that troops (should) set off at once. 司令员命令部队 马上出发。
2. The reason is ___ he is unable to operate the machine.
A. because B. why C. that D. Whether
3 .That is ___ they separated. A. that B. what C. which D. where
必修三Unit3语法宾语从句与表语从句
宾语从句——(whether & if) 意为“是否” whether和if都可以引导宾语从句,但是以下 情况不用if。 当whether后紧跟or not时,不用if. e.g.: I don’t know whether I will stay or not. 介词后面的宾语从句不能用if. e.g.: I worry about whether I hurt her feelings. whether to do 做动词宾语不能用if to do. e.g.: I haven’t decided whether to go there.
3. Before the sales start, I make a list of ______ my kids will need for the coming season. (山东2010) A. why B. what C. how D. which
4. Cindy shut the door heavily and burst into tears. No one in the office knew ______ she was so angry. (湖南2010) A. where B. whether C. that D. why
特殊： The teacher had made it clear that whoever breaks the rule would be punished. 老师已经说得很清楚，任何违反规定的人 都要被惩罚。
find / feel/ consider/ make/think + it +adj. +that宾从
宾语从句和表语从句
Related Conception (相关概念)
必修三Unit_3_名词性从句__(宾语从句和表语从句)
3.This depends on _________the money we have is whether enough.
4. Her wish is ______she could lose weight soon. that
5. Could you tell me ________ Marry lives? where
宾语
2.Tom is a student.
表语
1. I heard that he joined the army. 2. Mrs Black won’t believe that her son has become a thief. 宾语从句:
宾语从句就是在复合句中作宾语的名词性从句, 通 常放在主句谓语动词(及物动词)或介词之后. 引导宾语从句的连词: that, if, whether 连接代词: who, whose, what, which 连接副词: when, where, how, why等.
(根据句子的意思)
or not.
(与or not连用时,应用whether ,表从不能用if)
练一练!
牛刀小试：
1.She asked Tom_____was the matter with his car. what 2.Will you tell me _____ I can keep healthy? how
从句用陈述句语序
8. He asks me _____ Tony lives. A.which B.who C. where D.if
请你归纳
1).宾语从句一律用____句的语序. 陈述 2).引导宾语从句的连词that也无实际意义,多数 省略 情况下可以_____. 省略 3).whether和if都可以引导宾语从句 但: (1).当whether后紧跟or not时,不用if. I don’t know whether I will stay or not. (2).介词后面的宾语从句不能用if. I worry about whether I hurt her feeling.
人教版-高中英语-必修三unit3-宾语从句引导词PPT优秀课件
Li Yong asks why we are so happy.
宾语从句
2021/6/3
Why ahare you so happy?
15
汇报性展示三: 观察这些宾语从句总结出引导
词的使用规则
1.Your mother asks you to have the meal. （陈述句）
She says that his mother asks him to have the meal.
宾语从句
2021/6/3
11
It is my fault!
陈述句
picture 2
She says that it is her fault.
宾语从句
2021/6/3
12
picture 3
Am I taller than you ?
一般疑问句
He asked if/ whether he was taller than
them.
宾语从句
Am I thaaller than you?
2021/6/3
13
picture 4 What are you doing?
特殊疑问句
The boy asks what we are doing.
宾语从句
2021/6/3
14
picture 5 Why are you so happy?
1. I know that he is right.
2. I wonder if he is coming.
3. I can't understand what he said just now.
4. He asked who she was.
必修3 Unit 3 The Million Pound Bank Note 宾语从句与表语从句
【本讲教育信息】一. 教学内容：名词性从句——宾语从句与表语从句二. 知识精讲在复合句中起名词性作用的句子叫名词性从句。
名词性从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，根据它在句中不同的语法功能，因此名词从句又分为主语从句、宾语从句、表语从句和同位语从句。
（一）宾语从句1. 概念及引导词在复合句中起宾语作用的从句叫宾语从句。
引导宾语从句的连接词有连接代词（who, whom, whose , what , which, whoever , whatever, whichever ）、连接副词(when , where , how, why )及从属连词(that , whether, if ).例：John said that he was leaving for London on Wednesday.约翰说他星期三要到伦敦去。
I am glad that you are satisfied with your job.你对工作满意我感到很高兴。
She will name him whatever she wants to.她高兴给他起什么名字就起什么名字。
That depends on where we shall go.那取决于我们去哪儿。
2. 宾语从句的种类常见的宾语从句有动词的宾语从句、介词的宾语从句和形容词的宾语从句三种。
（1）动词的宾语从句They know that the habit may kill them.他们知道这个习惯会害死他们。
They doubt whether or not Jack is a good student.他们怀疑Jack是否是一个好学生。
They wanted to see which shops offered the best advice and service.他们想了解哪家店提出的建议和提供的服务最好。
人教_高一英语必修三_Unit3_高考真题汇编-宾语从句和表语从句
Unit3 高考真题汇编-宾语从句和表语从句【真题解密】名词性从句解题思路：①题干句若是疑问句，首先将其还原成陈述语序；②观察设空前后，确定是什么从句；③回忆相关从句的用法特点，从而做出取舍；④将选项代入句子，看前后语意是否连贯。
一、宾语从句1.【2015•湖南】26.You have to know ________ you're going if you are to plan the best way of getting there.A. whatB. thatC. whereD. who答案：C【考点定位】考查动词宾语从句。
【名师点睛】判断是什么句子最关键，这个句子是由know引导的宾语从句，宾语从句的连接词有连接代词和连接副词。
因为从句部分缺少状语成分，答案就出来了。
正确解答该题需要理解句意以及注意上下文（you're going if you are to plan the best way of getting there.）的表达。
2.【2015•北京】33.I truly believe ________beauty comes from within.A. thatB. whereC. whatD. why答案：A解析：句意：我很相信美丽源自于内心！本题考查宾语从句。
从句部分不缺少任何成分，因此用that起到连接作用，也可以省略。
从句部分不缺少任何成分，因此用that起到连接作用，也可以省略。
故选A。
【考点定位】考查动词宾语从句。
【名师点睛】名词性从句分多种，宾语从句在考试中也是很常见的，要注意宾语是句子的一个重要成分，它可以由名词、代词、名词短语或句子充当。
当一个句子充当宾语时，这个句子就称之为宾语从句。
一般情况下，宾语从句可作谓语的宾语，也可做主语的宾语。
根据所选空在句中所作的成分来判断出是何种名词性从句。
3.【2015•浙江】6. If you swim in a river or lake, be sure to investigate ________ is below the water surface. Often there are rocks or branched hidden in the water.A. whatB. whoC. thatD. whoever答案：A解析：句意：如果你在河里或湖里游泳，请确定查看水面下有什么？通常总有一些石头或树枝藏在水里。
必修三 unit3 宾语从句 Grammar
必修三unit3 Grammar —宾语从句和表语从句一、宾语从句(在复合句中作宾语的从句叫宾语从句。
)1．连接词that 引导的宾语从句that在句中不充当任何句子成分，在口语或非正式文体中常被省去。
①We heard that one more person died in the conflicts of that country.我们听说又有一人在该国的冲突中死亡。
2．连接词whether/if 引导的宾语从句连接词whether/if 作“是否”讲时，常用在ask, care, find out, know, wonder 等动词后常跟带有疑问意义的宾语从句。
从句中仍保持陈述语序，whether或if 不担当句子成分。
②Do you know whether/if any decision has been arrived at?你知道是否已经做出决定了吗？3．连接代词和连接副词引导的宾语从句连接代词who, whom, whose, what, which, whatever, whoever, whomever, whichever连接副词when, where, how, why。
这些连接词都有词义，除引导从句外，还在从句中充当一定的成分，可作主语、宾语、表语、定语、状语等。
这种宾语从句有疑问意义，但不是疑问句，不能用疑问语序，而要用陈述语序。
③She always thinks of how she can work well. 她总是在想怎样把工作做好。
即学即练1 (1－1.根据句意填入适当的连接词)①我们决不能认为自己什么都好，别人什么都不好。
We must never think ______ we are good in everything while others are good in nothing.②我不知道他是否会出席会议。
I don't know _________ he will attend the meeting.③我想知道她去了哪里。
人教新课标高一英语必修三教案：Unit 3 The million pound bank note 宾语从句和表语从句用法归纳
宾语从句和表语从句用法归纳宾语从句和表语从句是名词性从句的重要组成部分，也是高考的重点。
今天我们先谈谈这两种从句。
一、宾语从句I. 宾语从句的引导词引导宾语从句的词有：连词that, if, whether；连接代词who, whom, whose, what, which；连接副词when, where, how, why等。
（1）连词that在宾语从句中不充当任何成分，也无任何意义，可以省略；其它带有疑问意义的连接词则不能省略。
如：I know (that) he is a good teacher.He doesn’t know who first discover-ed America.（2）whether与if①二者都有“是否”的意思，一般可以换用，但在介词之后，不定式之前，与or not连用时，只能用whether。
如：It all depends on whether they will support us.She stood in the doorway, unable to decide whether to go in.②引导否定的宾语从句时只能用if。
如：I wonder if he won’t hurt the feeling of his girlfriend.③另外引导主语从句（放在句首）、表语从句、同位语从句时，也只能用whether，不能用if。
（3）what在宾语从句中，引导词what具有两种含义：①保留疑问，即“什么”的意义；②相当于“all / everything that”，常译成“……的（东西或事）”。
II. 宾语从句注意事项（1）宾语从句无论用哪种连接词来引导，语序都必须用陈述语序，尽管有时有疑问意义。
如：Do you know when the lesson will begin?（2）要注意主、从句时态的一致和相应变化。
如：①当主句是一般现在时或一般将来时的时候，从句可根据说话人的需要选择适当的时态。
高一必修三英语unit3知识点
高一必修三英语unit3知识点高一必修三英语Unit 3 知识点本文将为您介绍高一必修三英语第三单元的知识点，帮助您更好地理解和掌握相关知识。
一、词汇与短语1. deliver v. 传送，递送例句：The postman delivered the package to my door this morning.2. tidy adj. 整洁的例句：Please keep your desk tidy and organized.3. faith n. 信任，信念例句：She has great faith in her abilities to succeed in life.4. launch v. 发起，推出例句：The company plans to launch a new product next month.5. consult v. 咨询，商议例句：You should consult your doctor before starting any new exercise routine.6. exclude v. 排除，不包括例句：The ticket price excludes drinks and snacks.7. accompany v. 陪同，伴随例句：I'll accompany you to the airport so that you won't get lost.8. focus n. 焦点，重点例句：The meeting's focus will be on the company's future expansion plans.9. transfer v. 转移，调动例句：He was transferred to the company's branch office in New York.10. obtain v. 获得，得到例句：You can obtain a copy of the report from the receptionist.二、语法知识1. 动词的时态和语态英语动词有多种时态和语态，如一般现在时、一般过去时、现在进行时、过去进行时、一般将来时、被动语态等。
人教版高中英语必修三Unit3TheMillionPoundBank-Note课文知识点解析
没有人喜欢被别人盯着看。
13.I didn’t know whether I could survive.
我不知道我能否幸存下来。
survive “幸存，从……中逃脱”，既可为及物动词，又可为不及物动词。
e.g.The house survived the storm.
was/were about to do when....“正打算……这时……”
e.g.I was about to leave home when something unexpected happened.
我正打算离家这时发生了意想不到的事情。
3.It is the summer of 1903，and Henry Adams，an American businessman，has had some very bad luck.
e.g.I wonder who he is.
我不知道他是谁。
I wonder where they come from.
我不知道他们是哪里的人。
(2)mind doing sth. 反对……，介意……
主要用于否定句、疑问句和条件句等。
e.g.Did she mind not getting the job?
我听见那个女孩正在房子里唱歌。
比较：hear sb. do sth. 听见某人做过某事
e.g.I heard the girl sing a song yesterday.
我昨天听见那个女孩唱了一首歌。
hear sth./sb. done 听见某人/某事被……
e.g.I heard my name called in the street.
必修三Unit3语法宾语从句与表语从句教案资料
连接词
一that宾语从句 1.Oliver believes (that) a man could survive a
month in London. 2 I’m afraid (that) I don’t quite follow you,sir. 3. I do1n.归’t t纳hi总nk结(t：hat) it’s very funny. 4.My tuhna充ctle在当sa引任id导何（宾成th语分at从，）句且h时通e w常无ou可词ld义以c，省om也略e 不。
什么是名词性从句? (Noun Clauses)
名词性从句(1)
• 宾语从句
一、宾语从句——共性问题 1，2
•They know that the habit will kill them. •He asked how much I paid for the violin. •I’ll tell you why I asked you to come. •It all depends on whether they will support us. •I don’t care who marries him. 观察： 1. 宾语从句可充当谁的宾语？ 2. 连接词的分类和作用？
which引导的宾语从句：
① She did not know what had
happened.
主语
② He asked whose purse it was. 定语
③ Do you know who/ whom Henry is
speaking to?
宾语
Q: 这些连接代词在宾语从句中充当什么成
表语从句
{ I don’t like his job. I don’t like what he does every day.
3.3-宾语从句-表语从句-教案
1 / 35教学过程一、课堂导入概念引入She doesn’t know (th at) her father is seriously ill. 她不知道她父亲病得很严重。
Can you tell me how I can get to the railway station? 你可以告诉我怎么去火车站吗？The problem is when they can get there. 问题是他们什么时候能到那儿。
The problem is whether we can replace her. 问题是我们能否替换她。
2 / 35二、复习预习复习什么是宾语和表语，列举作宾语和表语的词性。
3 / 35三、知识讲解知识点1：宾语从句的定义置于动词、介词等词性后面起宾语作用的从句叫宾语从句。
宾语从句的语序必须是陈述语序。
有些形容词（afraid ,sure ,glad等）之后也可以带宾语从句。
She doesn’t know (that) her father is seriously ill.Can you tell me how I can get to the railway station?划线部分是宾语从句。
4 / 35连词：that (that 常可省略),whether, if代词：who, whom, whose, what ,which, whoever, whomever, whatever, whichever 副词：when ,where, how, why 等。
She reminded me that I had a meeting to attend.I wonder whether(if) they will come to our party.None of us knows where these new parts can be bought.5 / 35宾语从句的语序是陈述句语序即：连接代词/副词+主语+谓语+其他成分。
必修三unit3宾语从句
Welcome to our class three!
Can you tell me who she is?
Audrey Hepburn 奥黛丽·赫本 奥黛丽 赫本
I’m Samuel Langhorne Clemens. How much do you know about me?
whether不能用 只能用 whether不能用 if 的情况
在介词后面： 1. 在介词后面： • I’m thinking of whether we should go fishing. • We are worried about whether it will rain tomorrow. 2. 在动词不定式前(whether to do sth.) ： sth.) • They asked me whether to go skating.
做表语
否定的转移
若主句谓语动词为think, consider, suppose, believe, 若主句谓语动词为 expect, imagine等， 等 其后的宾语从句若含有否定意义，一般要把否定词 否定词转移 其后的宾语从句若含有否定意义，一般要把否定词转移 主句谓语上 到主句谓语上，从句谓语用肯定式。 I don’t think you are right.
Pay attention to the sentences
1 can you tell me who she is. 2 Do you know what Mark Twain’s real name is? 3 I wonder if you could lend me some money. 4 Could you tell me how I can lose weight?
高中英语必修三教师用书：Unit 3 Section ⅢGrammar—宾语从句和表语从句 含答案
Section ⅢGrammar——宾语从句和表语从句[语境自主领悟]一、名词性从句的连接词1．that引导的宾语从句由连接词that引导宾语从句时，that在句中不充当任何成分，在口语或非正式的文体中常被省去。
We learnt from his letter (that)he would come to Shanghai soon.从他的信中我们了解到他不久会来上海。
[名师点津]宾语从句中两种情况中的连接词that不能省略；①引导的第二个宾语从句前的that不可省；②在动词＋形式宾语it＋宾语补足语＋that引导的宾语从句中that不能省略。
He said(that)you were too young to understand the matter and that you were asked not to care about it.他说你太年轻，还无法理解这件事情，你也不要去管它。
We think it important that every citizen should obey the traffic rules.我们认为每个市民都应该遵守交通规则是很重要的。
[即时训练1]单句改错①He said he would give up the chance and he would try hard to look for another one.在and后加that②We found it strange no one would take the money.在strange后加that2．whether或if引导的宾语从句whether或if引导宾语从句时，在句中不充当成分，但是含“是否”之意，从句要用陈述语序。
I wonder whether/if we'll finish the task on time.我不知道我们能否按时完成这项任务。
I'll see whether/if I can advise him to accept it.我要看看我是否能劝他接受。
人教版高中英语必修三单元三Book3 Unit3 Grammar 宾语从句
一、that引导的宾语从句
that 在从句中 不充当成分,无词义,可以省略。
I hear that he will be back in a month.
1) We think (that) she is hard-working and that she will succeed.
2) I know nothing about him except that he is living in Beijing.
5W.在hdeistchuessr之后
We discuss _________ we should close the store.
whether
练一练: whether / if 1. I asked her w__h_e_t_h_e_r_/_i_f 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__th_e_r to go.
什么是名词性从句?
在句子中起名词作用的句子叫名词性从句。 在句中作主语、宾语、表语、同位语的句子叫 名词性从句。
主语从句 ( The Subject Clause)
名 词 宾语从句 ( The Object Clause) 性 从 表语从句 ( The Predicative Clause) 句
同位语从句 ( The Appositive Clause)
1. What he does is important.
必修三unit3宾语从句共41页文档
40、学而不思则罔，思而不学则殆。——孔子
必修三unit3宾语从句
1、合法而稳定的权力在使用得当时很 少遇到 抵抗。 ——塞 ·约翰 逊 2、权力会使人渐渐失去温厚善良的美 德。— —伯克
3、最大限度地行使权力总是令人反感 ；权力 不易确 定之处 始终存 在着危 险。— —塞·约翰逊 4、权力会奴化一切。——塔西佗
5、虽然权力是一头固执的熊，可是金 子可以 拉着它 的鼻子 走。— —莎士 比
谢谢！Βιβλιοθήκη 36、自己的鞋子，自己知道紧在哪里。——西班牙
37、我们唯一不会改正的缺点是软弱。——拉罗什福科
xiexie! 38、我这个人走得很慢，但是我从不后退。——亚伯拉罕·林肯
39、勿问成功的秘诀为何，且尽全力做你应该做的事吧。——美华纳
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• I think it necessary that you should read English aloud. • We heard it that she would get married next month.
I didn’t know whether I could ---------------------------========== survive until morning. ==== ==============================
Object Clauses
宾语从句
M3U3 Grammar
（简单句） 简单句）
1. I
主语
know him .
谓语 宾语
（复合句） 复合句）
2. I
主语 主
know who
谓语 句
he
is .
连词 从句主语 从句谓语 宾语从句
什么是宾语？
• • • • I know him. Do you have the time? I think (that) she is beautiful. Why don’t you pay attention to me?
由从属连词 whether, if 引导的宾语从句
if/ whether “是否”，说明对陈述的事物不明确或不清 是否” 是否 常用在ask, wonder, can(could) you tell me 等后。 等后。 楚。常用在
if (whether) he will go to I want to know _______________________ the park with us _______________. whether (if) he can come 2. Ask him _________________________. whether it is going to rain or not 3. I wonder ____________________________. 4. Could you tell me________________________? whether(if) Mr Li lives here
that——不能省略的 种情况 不能省略的2种情况 不能省略的
作介词except, （1）当that作介词except, in 宾语时 ） 作介词
•They believe in that she must still be single. •I know nothing about him except that he is living in Beijing.
二、语序 宾语从句的语序用陈述语序： 宾语从句的语序用陈述语序： 陈述语序 连接词+主语+谓语+其他成分 连接词+主语+谓语+
主句+连接词 从句 其他成分） 主句 连接词+从句（主+谓+其他成分） 连接词 从句（ 谓 其他成分
1. When will he go to the library? His brother asks when he will go to the library . His brother asks when will he go to the library . 2. What did he want to buy ? I don’t know what did he want to buy . I don’t know what he wanted to buy .
宾语从句要 掌握三个方面： 连接词 _______， 时态 语序 ______和______。
连接词有四类 ⑴ _________________ ⑵ _________________ ⑶_________________ ⑷__________________
时态的呼应： 语序为：
当主句的谓语动词 用过去时时，从句中 的谓语应用 ___________时态
Oliver believes that with a million pound bank note a man could ================ survive a month in London.
===========
I can’t say that I have any plans. I’m afraid I don’t quite follow you I think I’ll be on my way. We know you’re hard working. I’m afraid I don’t quite follow you may I ask you how much money you have
3.当与 not连用，或提出两种选择时: 当与or 连用， 当与 连用 • I don’t know whether he’s free or not. • Mary asked whether I was doing my homework or not. • Tell me whether you’d like to go shopping or tidy the room. 4. 宾语从句提前时： 宾语从句提前时： • Whether this is true or not, I can’t say.
Practice time if / whether if / whether 1. I asked her __________ she had a bike.
2. We’re worried about ________ he is safe. whether
whether /if 3. I wonder ___________ he is well. whether 4. I don’t know ________ or not he is well. whether 5. I don’t know _______ to go.
宾语 位于谓语动词或者介词后 动作的承受者
指出主谓宾表
• • • • • • • • • 1.Whether we’ll go depend on ——————— . the weather 2. People’s standards of living are going up steadily . —————— 3. That was how they were—————— defeated. 4.The nursery takes good care of ——————— . our children 5.I’ll return ————— to you tomorrow . the book 6.We are sure that —————————— . we shall succeed 7.The woman with a baby in her arms is his other . ————— 8.There are many film that I’d like to see. —————— 9.Have you met the person about whom he was —————— speaking ?
（一）引导词
1 2
由从属连词 that 引导的宾语从句 由从属连词 whether, if 引导的宾语从句 由连接代词 Who,whom,whose,which,what 和连接副词 where,how,why,when 引导的宾语从句
3
------------------------------------
由连接代词 Who,whom,whose,which,what 和连接副词 where,how,why,when引导的宾从 引导的宾从 代词或副词连接主句和从句， 代词或副词连接主句和从句，并在从句中担任 句子成分，具有一定的意义，不可省略。 句子成分，具有一定的意义，不可省略。 who could answer the question 1. He asked _____________________________. whom they are waiting for 2. Do you know_________________________? 3. He asked_______________________________. whose bike was the best in the class 4. Do you know _________________________? when we’ll have a meeting 5. Please tell me _____________. where he is how I can get to the station 6. Can you tell me ________________________? why the train is late 7. Could you tell me ______________________?
注：当从句的原句为以下句子 以及what, who作主语时，语序不变： 作主语时， 以及 作主语时 语序不变： What’s wrong? What’s the matter? What’s happening? What happened? eg: I don’t know what’s the matter.
（2）用it做形式宾语的宾语从句时 ） 做形式宾语的宾语从句时
（ it常可以放在动词 常可以放在动词think, find, consider, believe, feel, make等 等 常可以放在动词 后作为形式宾语，而真正的宾语——that从句则放在句尾） 从句则放在句尾） 后作为形式宾语，而真正的宾语 从句则放在句尾
只能用 whether不能用 if 的情况
1. 在介词后面： 在介词后面： • I’m thinking of whether we should go fishing. • We are worried about whether it will rain tomorrow. 2. 在动词不定式前(whether to do sth.) ： • They asked me whether to go skating.