螃蟹横走
学习是一个坚持不懈的过程，走走停停便难有成就。比如烧开水，在烧到80度是停下来，等水冷了又烧，没烧开又停，如此周而复始，又费精力又费电，很难喝到水。以下是我给大家整理的 高二英语 选修三第二单元知识点，希望大家能够喜欢!
高二英语选修三第二单元知识点1
一、引导主语从句的连词主要有：
从属连词：that whether
连接代词：who whoever whom whose what whatever which whichever
连接副词：when where how why
二、用法
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。
1. It 作形式主语和it引导强调句的比较
①主语从句常用it作形式主语，一般常用句型为：It is+{名词/形容词/过去分词}+主语从句例如：
It is still a question whether she will come or not.
It is strange that you should like him.
It is still unknown which team will win the match.
另外，还有一些比较多见的结构：
It turned out that……;
It has been proved that……;
It happened/occurred that……;
It is well-known that……等等
②而强调句则不同，它的结构是：It+be+被强调部分+that+从句
强调主语：It is the times that produce their heroes.时势造英雄
强调宾语：It is English that Prof.Lin teaches us.
强调状语：It was in shanghai that I saw the film.
判断是否是强调句有一个 方法 ，就是将that以后的“句子的其余部分”拿出来单独看，看有没有缺成分，缺的是什么成分，再把谓语动词后面that前面的那部分，带到你认为缺成分的地方，如果放进去是一句完整的句子了，那就说明是强调句。
2. 用it 作形式主语的结构
(1) It is +名词+that从句
It is a fact that … 事实是……
It is an honor that …非常荣幸
It is common knowledge that …是常识
(2) it is +形容词+that从句
It is natural that… 很自然……
It is strange that… 奇怪的是……
(3) it +不及物动词+that从句
It seems that… 似乎……
It happened that… 碰巧……
(4) it is+过去分词+that从句
It is reported that… 据报道……
It has been proved that… 已证实……
3.主语从句不可位于句首的五种情况
(1) if引导的主语从句不可居于复合句句首。
(2) It is said , (reported) …结构中的主语从句不可提前。例如：
It is said that President Jingo will visit our school next week.
(3) It happens…, It occurs… 结构中的主语从句不可提前。例如：
It occurred to him that he failed in the examination.
(4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如：
It doesn’t matter whether he is wrong or not..
(5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如：
Is it likely that it will rain in the evening?
4. What 与that 在引导主语从句时的区别
What 引导主语从句时在从句中充当句子成分，如主语.宾语.表语，而that 则不然。例如：
What you said yesterday is right.
三、宾语从句用以区分主语从句的几个特征
1、引导词：what which whose when whet herif where
2语序：宾语从句必须是用陈述语句。(名词性从句都是陈述语序)
如：I think that you must work harder.
宾语从句的引导词、连接词的区别、否定转移等现象。
补充：从句的语序永远是陈述句。
高二英语选修三第二单元知识点2
【First aid知识点】
1. first aid 的意思是“急救”，例如：first aid to the injured 给予伤员的急救。
短语 联想：
give/offer aid 援助 come to sb's aid 帮助某人
teaching aids 教具 medical aid 医疗救护
with the aid of 借助于
get injured 受伤，在现代英语中大量地出现了由“get + 及物动词不达意的过去分词”构成的被动语态，这叫 get - 型被动语态。又如：
The computer got (was)damaged when we were moving. 我们搬家的时候，电脑碰坏了。
高二英语选修三第二单元知识点3
Worried about the journey, I was unsettled for the first few days.
Well-known for their expertise, his parents’ company …..
Confused by the new surroundings, I was hit by the lack of fresh air.
Exhausted, I slid into the bed and fell fast asleep.
过去分词作状语：过去分词作状语时，说明动作发生的背景或情况，其等同于一个状语从句。vt 过去分词作状语时与主句主语构成被动关系，表示被动和完成，vi 过去分词表示状态或动作的完成。
Heated , water changes into steam .
The professor came in, followed by a group of young people .
1 作原因状语，等于as / since / because 引导从句
Moved by what she said ,we couldn’t help crying . = ( As we are moved by what she said …
2 作时间状语，等于when 引导时间从句，如果分词表示的动作与谓语的动作同时发生，可在分词前加when/ while / until 等使时间意义更明确。
When heated , water can be changed into steam .
Seen from the hill ,the park looks very beautiful .= ( When the park is seen from the hill…
3 作条件状语等于 if / whether 引导从句
Given more attention , the cabbages could have grown better .= ( If they have been given more attention ….
Compared with you , we still have a long way to go = ( If we are compared with you
4 作方式或伴随状语
The actress came in , followed by her fans .
She sat by the window , lost in thought .
5 作让步状语
Much tired ,he still kept on working .=(Although he was tired ,) he ….
6 独立主格结构： 当分词的逻辑主语不是主句主语时，分词可以有自己独立的逻辑主语，这种结构称为独立主格结构。常用来表示伴随情况。
The boy rushed into the classroom , his face covered with sweat .
All things considered ,your article is of great value than hers .
Rewrite with proper conjunctions
Example : United we stand, divided we fall.
If we are united, we will stand, but if we are divided,we will fall.
1 Asked what had happened, he told us about it.
→When he was asked what had happened, …
2 Well known for his expert advice, he received many invitations to give lectures.
→Because he was well known for his expert advice, …
3 Given more time, we would be able to do the work much better.
If we were given more time,
4 Once translated into Chinese, the book became very popular among Chinese teenagers.
Once it was translated into Chinese,
5 Deeply interested in medicine, she decided to become a doctor.
Because she was deeply interested in medicine,
6 Left alone at home, Sam did not feel afraid at all.
Although he was left alone at home,
现在分词与过去分词作状语
现在分词作状语时，与其逻辑主语之间是主动关系，;而过去分词与其逻辑主语之间则表示被动关系。
Seeing these pictures, I couldn’t help thinking of those days when I was in Beijing . Seen from the top of a thirty-storeyed building, Beijing looks more magnificent. (see)
选择现在分词还是过去分词，关键看主句的主语。如分词的动作是主句的主语发出，分词就选用现在分词，反之就用过去分词。例如：
Used for a long time, the book looks old.
由于用了很长时间，这本书看上去很旧。
Using the book, I find it useful.
在使用的过程中，我发现这本书很有用
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度兰度兰
文章 读完后，还要学习归纳、综合和推理判断。有时候，将比较难的英文 句子 译成中文对准确的理解英文很有好处。中学英语课本中的课文和一些英语名篇都可以作为精读的材料。泛读是中学生容易忽略的一种阅读方式。我带来了 高二英语 选修八的知识点解析，希望能帮助到你!
高二英语选修八的知识点解析1
Ⅰ.Hot words and hot phrases常用词与常用词组
1.Medical studies show that AIDS virus cannot be transmitted via the following routes：cups，glasses，toilet seats，swimming pools，mosquitoes，other insects or blood donation.(P.49)
2.AIDS is a disease that breaks down the body's immune system and leaves a person defenceless against infections and illness.(P.51)
3.People get AIDS after having been infected with the HIV virus.(P.51)
4.People transmit HIV by having unprotected sex，by receiving infected blood transfusions or，as in Xiaohua's case，through birth.(P.51)
5.Xiaohua's mother contracted the HIV virus when she was 28，and she died of AIDS only three years after Xiaohua was born.(P.51)
6.The disease is spreading faster in Africa and parts of Asia，mainly because of a lack of proper health care，prevention and education.(P.51)
7.The drugs that are available are much too expensive and difficult to find.(P.51)
8....but she does not let that knowledge discourage her.(P.51)
9.She also goes to visit other AIDS patients in hospitals across the country to support them and cheer them up.(P.51)
10.The disease is not the only thing that AIDS patients have to suffer from.(P.52)
11....that can persuade hospitals and companies to allocate more funds for AIDS research and education.(P.52)
12.Xiaohua has learnt to live with HIV and the fact she will eventually get AIDS.(P.52)
13.Two years ago，Dr Richards had asked me a great many questions and had taken samples of my blood.(P.55)
14.Mum held my hand and I saw that she was weeping.(P.55)
15.Cancer is a disease that begins in cells.(P.55)
16.In my body，the production of cells is disrupted.(P.55)
17.Doctors do know that cancer is not caused by injury and is not contagious—it does not spread from one person to another.(P.55)
18.The cancer in my body has been defeated for the moment.(P.55)
19.Living with cancer has made me realize how precious life is and how important it is for us to take every chance to live life to the fullest.(P.55)
20.Every day is a new opportunity and I have learnt to appreciate every minute of each day.
Ⅱ.Language points and grammar focus语言点和语法重点
A.Language points语言点
1.HIV/AIDS is incurable...(P.49)
AIDS is a disease that...leaves a person defenceless against infections and illness.(P.51)
本单元中由前缀或后缀派生出的 反义词 的小结
2.People get AIDS after having been infected with the HIV virus.(P.51)
完成时的动名词的被动式的内涵及用法
3.As with most diseases and disasters，the young suffer the most.
“定冠词 + 形容词/过去分词”表示“一类人”的用法的小结
4.I had been feeling sick for a long time and my mum had taken me to hospital to have me examined.(P.55)
1)过去完成进行时的内涵及用法
2)“to have + 宾语 + 过去分词”的两个内涵及用法
5.The treatment was successful and I was able to go home after exactly fourteen months，two days and six hours in hospital.(P.55)
was/were able to do与could do在内涵上的区别及各自的用法
6.I have been living with cancer for two years and...(P.55)
现在完成进行时的内涵及用法
Ⅲ.Skills of the four essential abilities：listening，speaking，reading and writing听、说、读、写四项基本能力的学习技巧
1.Listening：Master the main idea of a long dialogue through the inner connections among the questions so as to have better understanding of the questioned details
从各设问间的内在联系把握较长对话的中心思想，更好理解各检测点的细节
2.Speaking：Talk about deadly diseases and attitudes towards AIDS，cancer，etc.
关于那些致命疾病及对待艾滋病、癌症等的态度的谈论
3.Reading：Make full use of informational words and phrases
充分利用信息词
4.Writing：How to write a personal narrative
如何写一篇个人经历过的叙述性 故事
高二英语选修八的知识点解析2
1. Instead of spending your vacation on a bus, ... you may want to try hiking. Instead和instead 0f的用法
2. Say "Hi" / "Hello" / "Thanks" to sb. (for me) 问候的句型
3. Is anybody seeing you off? 进行时表将来
4. She struggled and struggled, and could not get on her feet. (= keep struggling)
5. You should not go rafting unless you know... unless引导条件状语从句，相当于if... not
6. By staying at..., tourists can help the villagers make money so that they can take care of the fiver and the birds. 目的状语从句
7. She was so surprised that she couldn't move. 结果状语从句
8. Tree after tree went down, cut down by water. 过去分词作状语
9. The next moment, the first wave swept her down, swallowing the garden. 现在分词作状语
10. However, before she could think twice, the water was upon her. It didn't take long before the building was destroyed. before的用法
高二英语选修八的知识点解析3
1. cultural relics 文化 遗产
Many unearthed cultural relics were exhibited at the museum.
博物馆展出了许多出土文物。By definition the capital is the political and cultural center of a country. 根据定义,首都是一个国家的政治文化中心。
2. rare and valuable 珍贵稀有
It is rare to find such a genius nowadays.
这样的天才现在很少见。
The flaw in this vase makes it less valuable. 这个花瓶因为有点缺陷，不那么值钱了。
3. in search of 寻找，寻求 = in search for
He's sailed the seven seas in search of adventure. 他闯荡七大洋去历险.
He went to the south in search for a better future.他为了寻找更好的前途到南方去。
4. in the fancy style 以别致的风格 in … style/ in the style of ……以……风格
These clothes are too fancy for me, I prefer plainer ones. 这些衣服对我来说有些花哨，我还是喜欢素净些的。
5. popular
She is popular at school. 她在学校里很受人喜欢。
This dance is popular with young people. 这种舞很受青年人喜爱。
6. …a treasure decorated with gold and jewels, which took the country’s best artists about ten years to make. 用金银珠宝装饰起来的珍品，一批国家秀的艺术家用了大约十年的时间才把它完成。
decorate with 以...装饰
7. be designed for …为……而设计
by design 故意地
My brother designs to be an engineer. 我弟弟立志要当工程师。
This room was originally designed to be my study. 这间屋子原预定做我的书房。
His parents designed him for the army, but he preferred the navy. 他父母打算要他当陆军，但是他却喜欢当海军。
8. belong to 属于
We belong to the same generation. 我们属于同代人。
9. in return 作为回报/报答/交换
in turn 依次地，轮流的;转而，反过来
10. a troop of 一群He is surrounded by a troop of friends. 他被一群朋友围住了。
11. become part of… 变成……的一部分
It is part of the way we act.
它是我们行为表现的一部分。
12. serve as
作为，用作，充当，起作用
The room can serve as a study. 这间房子可作书房用。
13. a small reception hall for important visitors 接待重要来宾的小型会客室。
14. Later，Catherine II had the Amber Room moved to a palace outside St Petersburg where she spent her summers. 后来，叶卡捷琳娜二世派人把琥珀屋搬到圣彼得堡郊外她避暑的宫殿中。
have sth done
请/让别人做某事，使得，蒙受某种损失
We had the machine repaired.
我们请人把机器修好了。
15. In 1770 the room was completed the way she wanted. 1770年，这间琥珀屋按照她的要求完成了。 ( I was never allowed to do things the way /that/ in which I wanted. 我从来不允许按照自己的想法去做事情。)
16. Sadly, although the Amber Room was considered one of the wonders of the world, it is missing. 可悲的是，尽管琥珀屋被认为是世界上的一大奇迹之一，可是现在它却消失了。
I am considering going abroad. 我正在考虑 出国 。
I consider it a great honor.我认为这是极大的荣幸。
We consider that the driver is not to blame. 我们认为这不是司机的过错。
We consider it (to be ) true.=(We consider that it is true.) 我们认为这是真实的。
a couple of words missing 缺的两三个字
There is a page missing. 缺少一页。
Police are combing the woods for the missing children.警察搜遍树林以寻找失踪的孩子.
17. be at war 处于战争状态,交战
18. remove some furture and small art objects 把一些家具和小件艺术品搬走
He removed the mud from his shoes. 他去掉鞋上的泥。
This old table is a valuable piece of furniture. 这张旧桌子是一件很珍贵的家具。
19. in less than two days 在不到两天的时间里
20. There is no doubt that the boxes were then put on a train for… 毫无疑问，这些箱子后来被装上了运往……的火车。
There is no doubt that she will keep her word.毫无疑问她会遵守诺言的.
There is no doubt that Taiwan belongs to China. 这是毫无疑问的,台湾属于中国。
There is no doubt that she is capable of the job.她能胜任这个工作,这是毫无疑问的.
21. After that, what happened to the Amber Room remains a mystery. 从那以后，琥珀屋的去处便成了一个谜。
it remains to be seen 尚待分晓
The fact remains to be proved.事实尚待证明?
remain in呆在家里 remain out呆在外面, 留在户外
These matters remain in doubt. 这些事情仍然值得怀疑
He's determined to remain loyal to the team whatever comes his way. 他决心不管发生什么事都忠于球队。
Peter became a judge but John remained a fisherman. 彼得当了法官，但约翰仍然是个渔民。
22. By studying old photos of the former Amber Room, they have made the new one look like the old one. 通过研究琥珀屋原来的照片，他们建造的新琥珀屋样子和旧的看起来非常像。
23. One day he was looking in a second-hand furniture shop when he saw an amazing object among the many different vases and jewels. 一天，他正在一家二手家具商店查找，突然他在众多不同的花瓶和首饰中看见一个神奇的东西。
24. without doubt 无疑地，确实地
He is without doubt the cleverest student I've ever taught.
他确实是我所教过的学生中最聪明的.
25. the UN peace-keeping force 联合国维和部队
26. The old man saw some Germans taking apart the Amber Room and receiving it.
那位老人看见一些德国人把琥珀屋拆开搬走了。 take apart 拆卸，拆开
Take apart the pieces before putting the toys away. 玩具拿开前先将它拆成一件件的。
27. In a trial, a judge must decide which eyewitnesses to believe and which not to believe. 在审讯中，法官必须确定哪些目击者可信哪些不可信。
28. rather than
胜于，而不是
Tom rather than Jack is to blame. 该受责备的是汤姆，而不是杰克。
I prefer to read rather than sit idle. 我宁愿读书而不愿闲坐着。
We aim at quality rather than quantity. 我们的目的是重质不重量。
29. by the light of the moom 借助于月光
30. for oneself 亲自，独自地
One should not live for oneself alone. 一个人不应只是为自已活着。
31. To my surprise the entrance to the mine was closed 使我感到惊奇的是矿口被封闭了。…….
32. I think highly of those who are searching for the Ambe Room. 我认为那些在找寻琥珀屋的人们很了不起。
33. Nor do I think they should give it to any government. 我也不认为他们会把它交给任何政府。
34. do with 处理，忍受，对付
I can't do with his insolence.
我忍受不了他那傲慢无礼的态度
What do they do with the coin?
他们是怎样处理这枚硬币的?
35. take notes of 记录，把……记下来
Please take notes of the important while you read. 请边读边把重要的事情记下来。
36. Read the information that is provided for the visitors. 阅读一下为参观者提供的信息。
They provide us with food. 他们供给我们食物。
We provided food for the hungry children. 我们为饥饿的孩子们提供食物。
It's wise to save some money and provide for the future. "积蓄点钱,为将来使用作些准备是明智的。"
He has a wife and seven children to provide for. 他需要赡养妻子和七个孩子。
37. It will not only give you a chance of practising your English but also of developing an interest in local history at the same time.它不仅给你了练习英语的机会而且在同时也给你了培养对当地历史感兴趣的机会。
38. for fun 为了消遣，为了开心
He plays violin just for fun.
他拉小提琴只是为了自娱自乐。
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