外研版（2019）选择性必修 第四册Unit 3 The World Meets China Ⅲ Using Language课件（共53张PPT）
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| 名称 | 外研版（2019）选择性必修 第四册Unit 3 The World Meets China Ⅲ Using Language课件（共53张PPT） |  | |
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| 科目 | 英语 | ||
| 更新时间 | 2024-07-01 12:18:38 | ||
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(共53张PPT)
Unit 3 The world meets China
Using language
复习状语从句
Ⅰ.观察感悟
1.You can only imagine how travellers felt when they saw the oasis of Dunhuang ahead of them.
2.If you look up, you can see the paintings and other artworks that are testimony to how the Silk Road brought East and West together.
3.The Apsaras are depicted sailing in the bright blue sky， with their scarves flying, as if they are about to fly down to meet us.
4.In the Ming Dynasty, trade routes changed and Dunhuang was not as prosperous as it used to be.
5.Gradually, it faded from memory, even though it was once such a great city.
6.Given that the theme of the Expo was to promote cultural
exchange and strengthen mutual cooperation between the countries
along the Silk Road, Dunhuang was the ideal place.
观察上面的句子，其中加黑部分都是高中阶段需要掌握的状语从
句，它们分别是______________、______________、______________、
______________、______________、______________。
时间状语从句
条件状语从句
方式状语从句
比较状语从句
让步状语从句
条件状语从句
Ⅱ.要点精析
状语从句是指在句子中作状语，起副词作用的从句。根据其作用一般分为：时间状语从句、地点状语从句、条件状语从句、让步状语从句、目的状语从句、结果状语从句、比较状语从句等。
1.时间状语从句
（1）when、while与as引导的时间状语从句
when 意为“当……时”，可与延续性动词或非延续性动词连
用；从句的动作和主句的动作可以同时发生，也可以先
后发生
while 意为“当……时”，只可与延续性动词连用
as 意为“一边……一边……；随着”，常与延续性动词连
用，强调主句和从句动作同时发生
Online shopping is really convenient when you don't have time to go in person!
当你没有时间亲自去的时候，网上购物真的很方便！
While I was reading, he came in.
我正在看书时，他进来了。
The students sang as they walked.
学生们边走边唱。
（2）before与since引导的时间状语从句
连词 词义 常用句式
befor e 在……之前；还 未……就……；……（之后） 才……；还没来得 及……就…… ①It will （not） be+一段时间+before...
（没有）过……（时间）才……
②It was not long before... 不久……
就……
③It was+时间段+before... 过了…… （时
间）才……
since 自从……以来 It has been/is+一段时间+since... （从句
用一般过去时）自从……已有多长时间
It won't be long before we meet again.
用不了多久我们就会再见面。
It was three days before he came back.
三天后他才回来。
It has been/is more than 10 years since we last met each other.
距离我们上次见面已经有十多年了。
温馨提示 since引导的从句中，假如动词是非延续性动词，那么所表示的动作是自从句谓语动作算起；若用延续性动词或状态动词，所表示的就是自动作或状态的完成或结束时算起。
It's three years since she was in our class.
她离开我们班有三年了。
（3）until与till引导的时间状语从句
①until与till引导时间状语从句的区别
until 可以放在句首 not...until可用于强调句型
till 不可放在句首 一般不用于强调句型
Until you told me, I had no idea of it.
在你告诉我之前，我对此一无所知。
②not until位于句首时，主句要部分倒装。
Not until he told me about it again did I have any idea of it.
直到他又告诉我一遍此事我才明白。
③until/till用于肯定句时，主句的谓语动词是延续性动词；用于否定句时，主句的谓语动词是非延续性动词。
I waited patiently until/till the oil was hot.
我耐心地等待，直到油变热了。
You can't leave until I come back.
直到我回来你才可以离开。
（4）其他引导时间状语从句的词或短语
①as soon as、the moment/minute/instant、immediately/directly/instantly
Immediately the clown appeared on the stage, the audience burst out laughing.
小丑一出现在舞台上，观众就突然大笑起来。
②hardly/scarcely...when...、no sooner...than...中，主句用过去完成时，从句用一般过去时；当no sooner...和hardly/scarcely...位于句首时，主句要用部分倒装。
Hardly/Scarcely had he heard the news when he began to make preparations.
他一听到这个消息就开始准备。
③名词词组each/every time、 the first（或其他序数词）time、（the）next/last time等。
（2021新高考Ⅰ）The first time I read the newspaper Youth, I felt an urge to finish reading it in one breath.
当我第一次读《青年报》时，我感到一种想一口气把它读完的冲动。
Each time I walk by this lake, I see the same old man fishing there.
每次我走过这个湖，我都看到同一个老人在那里钓鱼。
④by the time引导的时间状语从句如果用一般现在时，主句则用将来完成时；从句如果用一般过去时，主句则用过去完成时。
（2021天津6月）Mark is a genius. By the time he graduated, he had been offered jobs by a dozen computer companies.
马克是个天才。到他毕业时，已经有十几家电脑公司给他提供工作了。
By the time you come back, we will have finished the job.
到你回来的时候，我们将已经完成了这项工作。
2.条件状语从句
（1）引导条件状语从句的常见引导词有if、unless、as/so long as、 in case（假使）、 on condition that、provided/providing（that）、supposing （that）、given that等。
You'll fail the exam unless you study hard.
除非你努力学习，否则你会考试不及格。
As long as you don't lose heart, you will succeed.只要你不灰心，你就会成功。
You can use my car on condition that you return it tomorrow.
我的车子可以借给你，条件是明天必须归还。
（2）在条件状语从句中，用一般现在时代替一般将来时，用一般过去时代替过去将来时。
In case there is a fire, what will we do first
假如发生火灾，我们首先要做什么？
3.原因状语从句
because 用来回答why的提问，语气最强，一般放在主句之后
since/now that 表示已知的理由或稍加分析即可表明的原因，多放
在句首
as as引导的从句多放在句首，说明次要原因，主句说明
结果，常用于口语中
其他连词 seeing that（鉴于；由于）；in that（因为）；
considering（考虑到）；when（既然）等
The book is different from that one in that this one is about chemistry and that one about history.
这本书不同于那本书，因为这本是关于化学的，而那本是关于历史的。
I'm forever on a diet, since I put on weight easily. 我一直在节食，因为我的体重很容易增加。
4.让步状语从句
（1）although、though、as与while引导的让步状语从句
①although引导让步状语从句时，只能用正常语序；though引导让步状语从句时，可用正常语序，也可用倒装语序；as引导让步状语从句时只能用倒装语序，即从句中的表语、状语或谓语中的实义动词置于句首，若表语是单数名词，前置时要省略冠词。
Although/Though/While he may get into trouble, he always presents a calm smile.
尽管他可能会遇到麻烦，但他总是露出平静的微笑。
Although/Though/While I have met many people, I have never seen anyone who's as capable as John.
虽然我见过很多人，但我从未见过像约翰这么能干的人。
Child as/though he is, he knows a lot.
尽管他还是一个孩子，但他却懂得很多。
Try as he may, he never succeeds.
尽管他很努力，但他从未成功过。
②although与though都可以与yet、still、nevertheless连用，但不能和but连用。
③while引导让步状语从句时，一般置于句首。
While I admit that there are problems, I don't agree that they cannot be solved.
尽管我承认有问题存在，但我不同意这些问题不能解决（的观点）。
（2）even if与even though引导的让步状语从句
I want to do it, even if/though it takes me all the afternoon.
我想要做这件事，即使它会花去我整个下午的时间。
Even if/though I were in your place, I wouldn't take the job.即使我处于你的位置，我也不会接受这份工作。
（3）“no matter+疑问词”与“疑问词+ever”引导的让步状语从句
I'd like to embrace the future bravely, no matter what/whatever the challenge is.
我想勇敢地拥抱未来，无论有什么样的挑战。
温馨提示 whoever、whatever、whomever、whichever还可以引导名词性从句，但“no matter+疑问词”不可以。
（4）whether...or...引导的让步状语从句
Whether you come first or last, it is important to remember that at any sporting event, you face two opponents: your fellow competitors and yourself.无论你是第一个来还是最后一个来，重要的是要记住，在任何体育赛事中，你要面对两个对手：你的对手和你自己。
5.其他状语从句
类型 引导词
地点状 语从句 where、wherever、everywhere、anywhere等
目的状 语从句 so that、in order that、in case、for fear that等
so that与in order that引导目的状语从句时，常与can、
could、may、might连用；in order that引导的目的状语从句
可以置于主句前或后，但so that引导的从句只能置于主句
后。
类型 引导词
结果状 语从句 so that、so...that...、such...that...。在非正式语体中，由
so...that...、such...that...引导的句子中的that可以省略。
方式状 语从句 as、as if/though等
比较状 语从句 as...as、not as/so...as、the same...as...、比较级+than等
续表
We must camp where we can get water.
我们必须在能找到水的地方露营。
（2021全国乙）Online learning allows us to learn at any time wherever we are.
在线学习可以让我们在任何时候、任何地方学习。
I'll speak slowly so that you can make sense of what I say.
我会说得慢一些，以便让你听懂我说的话。
（2022浙江1月改编）I tried to make the best of time and didn't say anything for fear that I would make things worse.
我努力充分利用时间，少说话，以免把事情弄得更糟。
The man got such a fright that he dropped the bag and ran away.这个人吓了一跳，扔下手提包跑了。
The old lady treats the man as if he were her own son.老太太把男人当成自己的儿子对待。
We must act as the law requires.
我们必须依法办事。
He is taller than any other student in our school.他比我们学校的其他任何一个学生都高。
（2022新高考Ⅱ）As we age, even if we're healthy, the heart just isn't as efficient in processing oxygen as it used to be.
随着年龄的增长，即使我们很健康，心脏处理氧气的效率也不如以前高了。
6.状语从句的省略
在状语从句中，如果谓语动词含有be动词，且从句主语和主句的主语一致，或从句的主语是it，那么从句中的主语和谓语的一部分（尤其是be动词）往往可以省略。
Don't look at your cellphone when （you are） crossing the street.
过马路时不要看手机。
When （it is） published, the novel will become one of the best-sellers of the year.一旦出版，这部小说将会成为该年度的畅销书之一。
I could go back home every few months if （it is） necessary.
如果有必要，我可以每隔几个月回一次家。
Ⅲ.实战演练
用恰当的词填空
1. You should put the book _______you found it so that the owner
could find it easily.
where
2. Tired _________she was, she continued to finish the race.
as/though
3. He is sure to come _______ he has some urgent business.
unless
4. You may use the book __________________________you return it
on time.
as long as/on condition that
5. Don't ask for salt or pepper at a meal in Portugal,__________ it
shows the chef that you don't like his seasoning skills.
because/as
6. _______________________ you said, the old man wouldn't believe
you any more.
Whatever/No matter what
7. ______you think it over, please let me know what your decision is.
After
8. (2021新高考Ⅰ改编)The apartment was ________ tiny that we had to
leave our suitcases in the hallway.
because
9. I didn't manage to do it _____ you had explained how.
until
10. ___ you had come a few minutes earlier, you would have met
him.
If
语篇填空
My classmate Michael studied very hard 1._____ he went to
senior high school. Every day he worked 2._____ everyone left the
classroom. He said he wouldn't stop trying 3._______ he got
satisfying scores in his studies. Hard 4._________ he tried, he made
little progress, but he didn't lose heart at all 5.__________ he believed
as long as he persisted he would succeed one day. 6.____ time went
by, he made improvements in his studies and he was admitted to a
after
until
unless
as/though
because/as
As
university in Beijing at last. We had a get-together party 7._______
we started our new life in university. We had a very good time
8________everyone had got offers from universities. When we stood
9._______ we used to play and study, we couldn't help thinking of
our good old days. We would never forget each other, 10._________
we would go or whatever we would do.
before
because
where
wherever
词句精讲·夯实基础
1 what's more另外；而且；更为重要的是
情境佳句
①What's more, as the traditional is mixed with the modern, people can learn about the development of culture as a whole. （教材原句）
此外，随着传统与现代的融合，人们可以从整体上了解文化的发展。
②Besides football, what other sports do you like
除了足球外，你还喜欢哪些运动？
③What's worse, he didn't leave his address.
更糟糕的是，他没有留下他的地址。
归纳拓展
（1）what's more相当于besides、moreover或in addition等，可在句首或句中（常与and连用）。
（2）what's worse更糟糕的是
学以致用
［完成句子］
① 吸烟会污染环境。更糟糕的是，吸烟对我们的身体有害。
Smoking may pollute the environment. ___________________________
__________.
What's worse, it is harmful to our health
② 我认为参加这个活动可以开阔我的视野。此外，我还可以得到一些
宝贵的经验。
I think participating in the activity can broaden my horizons.
_____________________________________________________________
_________.
Moreover/Besides/In addition/What's more, I can get some precious experience
2 give an account of给出关于……的叙述/说明/报告
情境佳句
①Zhang Qian, a diplomat, gave a reliable account of the lands of Central Asia for the Han court.（教材原句）
外交官张骞为汉朝提供了一篇关于中亚土地的可靠叙述。
②Those who took no account of what the teacher said didn't behave well in the exam.
那些不认真听老师讲的人在考试中表现不佳。
③The gene they discovered today doesn't account forall those cases.他们今天发现的那种基因解释不了所有的那些情况。
归纳拓展
（1）account n.说明；叙述；账目；报告
give a good account of oneself （尤指比赛中）表现好，干得出色
take account of/take...into account考虑到；顾及
on account of由于，因为
on no account决不
注意：on no account 置于句首时，句子用部分倒装。
（2）account vt.认为是；视为
account for解释；说明；是……的说明（或原因）；（数量上、比例上）占
学以致用
［单句填空/句式升级］
① The train was delayed ____ account of a heavy fall of snow.
on
② Lighting accounts ____about 7% of the total electricity consumed
in the US.
for
③ The team gave a good account ___ themselves in the match.
of
④ The professor warned the students that they should on no account
use mobile phones in his class.
→The professor warned the students that on no account
_______________________________________.
should they use mobile phones in his class
3 The reason why...is that...
情境佳句
①The reason why he didn't come back on time was that he went to pay a visit to his friends.
他没有按时回来，因为他去拜访朋友了。
②The reason for such a serious accident that happened was that the driver was too careless and drank too much.发生这么严重的交通事故的原因是司机太粗心，而且喝了太多酒。
③That is why today over 40% of Californians speak Spanish as a first or second language.
那就是今天超过40%的加利福尼亚人把西班牙语作为第一或第二语言的原因。
归纳拓展
（1）The reason why...is that...可看作固定句式，意为“……的原因是……”。其中，主语是The reason，why引导的是定语从句，修饰reason；that引导的是表语从句。
The reason for... ……的原因。
（2）That is why...那就是为什么……
This is the reason why...这就是……的原因。
This/That is because...这/那是因为……（because引导表语从句）
注意
the reason后接的定语从句的引导词用why/for which还是用that/which，取决于其在定语从句中所承担的句子成分。缺少主语、宾语时用that或which；缺少状语时用why或for which。
学以致用
［单句填空/完成句子］
① He believed that the reason _____man is different from animals is
that man can think.
why
② When you laugh at yourself, you are likely to be more successful
in life. This is ________ laughing at yourself helps lift your mood in
the face of difficulties.
because
③ I think it's the reason __________made me get that character
reasonable.
which/that
④ 我认为我选择物理的原因是我觉得它能让我解决一些生活中的实际
问题。
I think ____________________________________it can help me solve
some practical problems in life.
the reason why I choose physics is that
Thanks
Unit 3 The world meets China
Using language
复习状语从句
Ⅰ.观察感悟
1.You can only imagine how travellers felt when they saw the oasis of Dunhuang ahead of them.
2.If you look up, you can see the paintings and other artworks that are testimony to how the Silk Road brought East and West together.
3.The Apsaras are depicted sailing in the bright blue sky， with their scarves flying, as if they are about to fly down to meet us.
4.In the Ming Dynasty, trade routes changed and Dunhuang was not as prosperous as it used to be.
5.Gradually, it faded from memory, even though it was once such a great city.
6.Given that the theme of the Expo was to promote cultural
exchange and strengthen mutual cooperation between the countries
along the Silk Road, Dunhuang was the ideal place.
观察上面的句子，其中加黑部分都是高中阶段需要掌握的状语从
句，它们分别是______________、______________、______________、
______________、______________、______________。
时间状语从句
条件状语从句
方式状语从句
比较状语从句
让步状语从句
条件状语从句
Ⅱ.要点精析
状语从句是指在句子中作状语，起副词作用的从句。根据其作用一般分为：时间状语从句、地点状语从句、条件状语从句、让步状语从句、目的状语从句、结果状语从句、比较状语从句等。
1.时间状语从句
（1）when、while与as引导的时间状语从句
when 意为“当……时”，可与延续性动词或非延续性动词连
用；从句的动作和主句的动作可以同时发生，也可以先
后发生
while 意为“当……时”，只可与延续性动词连用
as 意为“一边……一边……；随着”，常与延续性动词连
用，强调主句和从句动作同时发生
Online shopping is really convenient when you don't have time to go in person!
当你没有时间亲自去的时候，网上购物真的很方便！
While I was reading, he came in.
我正在看书时，他进来了。
The students sang as they walked.
学生们边走边唱。
（2）before与since引导的时间状语从句
连词 词义 常用句式
befor e 在……之前；还 未……就……；……（之后） 才……；还没来得 及……就…… ①It will （not） be+一段时间+before...
（没有）过……（时间）才……
②It was not long before... 不久……
就……
③It was+时间段+before... 过了…… （时
间）才……
since 自从……以来 It has been/is+一段时间+since... （从句
用一般过去时）自从……已有多长时间
It won't be long before we meet again.
用不了多久我们就会再见面。
It was three days before he came back.
三天后他才回来。
It has been/is more than 10 years since we last met each other.
距离我们上次见面已经有十多年了。
温馨提示 since引导的从句中，假如动词是非延续性动词，那么所表示的动作是自从句谓语动作算起；若用延续性动词或状态动词，所表示的就是自动作或状态的完成或结束时算起。
It's three years since she was in our class.
她离开我们班有三年了。
（3）until与till引导的时间状语从句
①until与till引导时间状语从句的区别
until 可以放在句首 not...until可用于强调句型
till 不可放在句首 一般不用于强调句型
Until you told me, I had no idea of it.
在你告诉我之前，我对此一无所知。
②not until位于句首时，主句要部分倒装。
Not until he told me about it again did I have any idea of it.
直到他又告诉我一遍此事我才明白。
③until/till用于肯定句时，主句的谓语动词是延续性动词；用于否定句时，主句的谓语动词是非延续性动词。
I waited patiently until/till the oil was hot.
我耐心地等待，直到油变热了。
You can't leave until I come back.
直到我回来你才可以离开。
（4）其他引导时间状语从句的词或短语
①as soon as、the moment/minute/instant、immediately/directly/instantly
Immediately the clown appeared on the stage, the audience burst out laughing.
小丑一出现在舞台上，观众就突然大笑起来。
②hardly/scarcely...when...、no sooner...than...中，主句用过去完成时，从句用一般过去时；当no sooner...和hardly/scarcely...位于句首时，主句要用部分倒装。
Hardly/Scarcely had he heard the news when he began to make preparations.
他一听到这个消息就开始准备。
③名词词组each/every time、 the first（或其他序数词）time、（the）next/last time等。
（2021新高考Ⅰ）The first time I read the newspaper Youth, I felt an urge to finish reading it in one breath.
当我第一次读《青年报》时，我感到一种想一口气把它读完的冲动。
Each time I walk by this lake, I see the same old man fishing there.
每次我走过这个湖，我都看到同一个老人在那里钓鱼。
④by the time引导的时间状语从句如果用一般现在时，主句则用将来完成时；从句如果用一般过去时，主句则用过去完成时。
（2021天津6月）Mark is a genius. By the time he graduated, he had been offered jobs by a dozen computer companies.
马克是个天才。到他毕业时，已经有十几家电脑公司给他提供工作了。
By the time you come back, we will have finished the job.
到你回来的时候，我们将已经完成了这项工作。
2.条件状语从句
（1）引导条件状语从句的常见引导词有if、unless、as/so long as、 in case（假使）、 on condition that、provided/providing（that）、supposing （that）、given that等。
You'll fail the exam unless you study hard.
除非你努力学习，否则你会考试不及格。
As long as you don't lose heart, you will succeed.只要你不灰心，你就会成功。
You can use my car on condition that you return it tomorrow.
我的车子可以借给你，条件是明天必须归还。
（2）在条件状语从句中，用一般现在时代替一般将来时，用一般过去时代替过去将来时。
In case there is a fire, what will we do first
假如发生火灾，我们首先要做什么？
3.原因状语从句
because 用来回答why的提问，语气最强，一般放在主句之后
since/now that 表示已知的理由或稍加分析即可表明的原因，多放
在句首
as as引导的从句多放在句首，说明次要原因，主句说明
结果，常用于口语中
其他连词 seeing that（鉴于；由于）；in that（因为）；
considering（考虑到）；when（既然）等
The book is different from that one in that this one is about chemistry and that one about history.
这本书不同于那本书，因为这本是关于化学的，而那本是关于历史的。
I'm forever on a diet, since I put on weight easily. 我一直在节食，因为我的体重很容易增加。
4.让步状语从句
（1）although、though、as与while引导的让步状语从句
①although引导让步状语从句时，只能用正常语序；though引导让步状语从句时，可用正常语序，也可用倒装语序；as引导让步状语从句时只能用倒装语序，即从句中的表语、状语或谓语中的实义动词置于句首，若表语是单数名词，前置时要省略冠词。
Although/Though/While he may get into trouble, he always presents a calm smile.
尽管他可能会遇到麻烦，但他总是露出平静的微笑。
Although/Though/While I have met many people, I have never seen anyone who's as capable as John.
虽然我见过很多人，但我从未见过像约翰这么能干的人。
Child as/though he is, he knows a lot.
尽管他还是一个孩子，但他却懂得很多。
Try as he may, he never succeeds.
尽管他很努力，但他从未成功过。
②although与though都可以与yet、still、nevertheless连用，但不能和but连用。
③while引导让步状语从句时，一般置于句首。
While I admit that there are problems, I don't agree that they cannot be solved.
尽管我承认有问题存在，但我不同意这些问题不能解决（的观点）。
（2）even if与even though引导的让步状语从句
I want to do it, even if/though it takes me all the afternoon.
我想要做这件事，即使它会花去我整个下午的时间。
Even if/though I were in your place, I wouldn't take the job.即使我处于你的位置，我也不会接受这份工作。
（3）“no matter+疑问词”与“疑问词+ever”引导的让步状语从句
I'd like to embrace the future bravely, no matter what/whatever the challenge is.
我想勇敢地拥抱未来，无论有什么样的挑战。
温馨提示 whoever、whatever、whomever、whichever还可以引导名词性从句，但“no matter+疑问词”不可以。
（4）whether...or...引导的让步状语从句
Whether you come first or last, it is important to remember that at any sporting event, you face two opponents: your fellow competitors and yourself.无论你是第一个来还是最后一个来，重要的是要记住，在任何体育赛事中，你要面对两个对手：你的对手和你自己。
5.其他状语从句
类型 引导词
地点状 语从句 where、wherever、everywhere、anywhere等
目的状 语从句 so that、in order that、in case、for fear that等
so that与in order that引导目的状语从句时，常与can、
could、may、might连用；in order that引导的目的状语从句
可以置于主句前或后，但so that引导的从句只能置于主句
后。
类型 引导词
结果状 语从句 so that、so...that...、such...that...。在非正式语体中，由
so...that...、such...that...引导的句子中的that可以省略。
方式状 语从句 as、as if/though等
比较状 语从句 as...as、not as/so...as、the same...as...、比较级+than等
续表
We must camp where we can get water.
我们必须在能找到水的地方露营。
（2021全国乙）Online learning allows us to learn at any time wherever we are.
在线学习可以让我们在任何时候、任何地方学习。
I'll speak slowly so that you can make sense of what I say.
我会说得慢一些，以便让你听懂我说的话。
（2022浙江1月改编）I tried to make the best of time and didn't say anything for fear that I would make things worse.
我努力充分利用时间，少说话，以免把事情弄得更糟。
The man got such a fright that he dropped the bag and ran away.这个人吓了一跳，扔下手提包跑了。
The old lady treats the man as if he were her own son.老太太把男人当成自己的儿子对待。
We must act as the law requires.
我们必须依法办事。
He is taller than any other student in our school.他比我们学校的其他任何一个学生都高。
（2022新高考Ⅱ）As we age, even if we're healthy, the heart just isn't as efficient in processing oxygen as it used to be.
随着年龄的增长，即使我们很健康，心脏处理氧气的效率也不如以前高了。
6.状语从句的省略
在状语从句中，如果谓语动词含有be动词，且从句主语和主句的主语一致，或从句的主语是it，那么从句中的主语和谓语的一部分（尤其是be动词）往往可以省略。
Don't look at your cellphone when （you are） crossing the street.
过马路时不要看手机。
When （it is） published, the novel will become one of the best-sellers of the year.一旦出版，这部小说将会成为该年度的畅销书之一。
I could go back home every few months if （it is） necessary.
如果有必要，我可以每隔几个月回一次家。
Ⅲ.实战演练
用恰当的词填空
1. You should put the book _______you found it so that the owner
could find it easily.
where
2. Tired _________she was, she continued to finish the race.
as/though
3. He is sure to come _______ he has some urgent business.
unless
4. You may use the book __________________________you return it
on time.
as long as/on condition that
5. Don't ask for salt or pepper at a meal in Portugal,__________ it
shows the chef that you don't like his seasoning skills.
because/as
6. _______________________ you said, the old man wouldn't believe
you any more.
Whatever/No matter what
7. ______you think it over, please let me know what your decision is.
After
8. (2021新高考Ⅰ改编)The apartment was ________ tiny that we had to
leave our suitcases in the hallway.
because
9. I didn't manage to do it _____ you had explained how.
until
10. ___ you had come a few minutes earlier, you would have met
him.
If
语篇填空
My classmate Michael studied very hard 1._____ he went to
senior high school. Every day he worked 2._____ everyone left the
classroom. He said he wouldn't stop trying 3._______ he got
satisfying scores in his studies. Hard 4._________ he tried, he made
little progress, but he didn't lose heart at all 5.__________ he believed
as long as he persisted he would succeed one day. 6.____ time went
by, he made improvements in his studies and he was admitted to a
after
until
unless
as/though
because/as
As
university in Beijing at last. We had a get-together party 7._______
we started our new life in university. We had a very good time
8________everyone had got offers from universities. When we stood
9._______ we used to play and study, we couldn't help thinking of
our good old days. We would never forget each other, 10._________
we would go or whatever we would do.
before
because
where
wherever
词句精讲·夯实基础
1 what's more另外；而且；更为重要的是
情境佳句
①What's more, as the traditional is mixed with the modern, people can learn about the development of culture as a whole. （教材原句）
此外，随着传统与现代的融合，人们可以从整体上了解文化的发展。
②Besides football, what other sports do you like
除了足球外，你还喜欢哪些运动？
③What's worse, he didn't leave his address.
更糟糕的是，他没有留下他的地址。
归纳拓展
（1）what's more相当于besides、moreover或in addition等，可在句首或句中（常与and连用）。
（2）what's worse更糟糕的是
学以致用
［完成句子］
① 吸烟会污染环境。更糟糕的是，吸烟对我们的身体有害。
Smoking may pollute the environment. ___________________________
__________.
What's worse, it is harmful to our health
② 我认为参加这个活动可以开阔我的视野。此外，我还可以得到一些
宝贵的经验。
I think participating in the activity can broaden my horizons.
_____________________________________________________________
_________.
Moreover/Besides/In addition/What's more, I can get some precious experience
2 give an account of给出关于……的叙述/说明/报告
情境佳句
①Zhang Qian, a diplomat, gave a reliable account of the lands of Central Asia for the Han court.（教材原句）
外交官张骞为汉朝提供了一篇关于中亚土地的可靠叙述。
②Those who took no account of what the teacher said didn't behave well in the exam.
那些不认真听老师讲的人在考试中表现不佳。
③The gene they discovered today doesn't account forall those cases.他们今天发现的那种基因解释不了所有的那些情况。
归纳拓展
（1）account n.说明；叙述；账目；报告
give a good account of oneself （尤指比赛中）表现好，干得出色
take account of/take...into account考虑到；顾及
on account of由于，因为
on no account决不
注意：on no account 置于句首时，句子用部分倒装。
（2）account vt.认为是；视为
account for解释；说明；是……的说明（或原因）；（数量上、比例上）占
学以致用
［单句填空/句式升级］
① The train was delayed ____ account of a heavy fall of snow.
on
② Lighting accounts ____about 7% of the total electricity consumed
in the US.
for
③ The team gave a good account ___ themselves in the match.
of
④ The professor warned the students that they should on no account
use mobile phones in his class.
→The professor warned the students that on no account
_______________________________________.
should they use mobile phones in his class
3 The reason why...is that...
情境佳句
①The reason why he didn't come back on time was that he went to pay a visit to his friends.
他没有按时回来，因为他去拜访朋友了。
②The reason for such a serious accident that happened was that the driver was too careless and drank too much.发生这么严重的交通事故的原因是司机太粗心，而且喝了太多酒。
③That is why today over 40% of Californians speak Spanish as a first or second language.
那就是今天超过40%的加利福尼亚人把西班牙语作为第一或第二语言的原因。
归纳拓展
（1）The reason why...is that...可看作固定句式，意为“……的原因是……”。其中，主语是The reason，why引导的是定语从句，修饰reason；that引导的是表语从句。
The reason for... ……的原因。
（2）That is why...那就是为什么……
This is the reason why...这就是……的原因。
This/That is because...这/那是因为……（because引导表语从句）
注意
the reason后接的定语从句的引导词用why/for which还是用that/which，取决于其在定语从句中所承担的句子成分。缺少主语、宾语时用that或which；缺少状语时用why或for which。
学以致用
［单句填空/完成句子］
① He believed that the reason _____man is different from animals is
that man can think.
why
② When you laugh at yourself, you are likely to be more successful
in life. This is ________ laughing at yourself helps lift your mood in
the face of difficulties.
because
③ I think it's the reason __________made me get that character
reasonable.
which/that
④ 我认为我选择物理的原因是我觉得它能让我解决一些生活中的实际
问题。
I think ____________________________________it can help me solve
some practical problems in life.
the reason why I choose physics is that
Thanks