unit1知识点整理

unit1知识点整理（精选6篇）

unit1知识点整理 第1篇

牛津译林版八年级英语unit1Friends核心

知识整理

1.I have long hair.我有长头发。

have “有” have sth.to do 有某事要做 have a cold 感冒

have ”吃,，喝” have a cup of tea喝一杯茶 have breakfast/ lunch/ supper吃早/中/晚餐

have to 不得不 have sth.on= have on sth.=wear sth.穿着，.I live with my family in a house close to some mountains.live with与，一起生活 live in 居住在，close to= near 接近，离，近(也可放于被修饰词之后做后置定语)I live close to the shops.我住得离商店很近。She is buying a flat close to her office.她正在购买一套靠近她办公室的公寓。

精品小编为大家提供的八年级英语unit1Friends核心知识大家仔细阅读了吗?最后祝同学们学习进步。鲁教版八年级英语上册unit2知识点总结

初二英语上册School life知识点梳理：unit2

unit1知识点整理 第2篇

3.everyone: 动词用单数，each + n(单)+动词单数my family in Beijing.(everything/someone)

四、语法

4.reading: in the Reading Club(Swimming,Simple Present Tense

Dancing)1.be : am/is/are+介词/名词/形容词

5.hard: work hard, study(ies)hard 2.do/does/don’t/doesn’6.swimming: go swimming, be good at swimming,eg.1._____ you good at football?

swim(动词)，swimmer(名词)2._____ you like playing football?

7.enjoy：3.______ she a good student?

8.4.______ he at home?

9.5.______ they swim in the swimming pool?

10.walk: walk sb, take sb for a walk6.____Kate and Tom in the Reading Club?

11.news: 不可数，12.player(n): play(v),play football 练习：

13.1.Do you like playing ______(网球)at school?

14.borrow: borrow…2.Drawing is one of my_______(hobby).15.say: say sth in English(speak/tell/talk)3.Amy is her _______(good)friend of all.16.sound: sound(s)great/wonderful/nice 4.I’d like ________(be)your friend.二、短语 5.His idea________(听起来)very great.1.come from/be from(Do/Does, Is/Are)6.My father reads________(报纸)after supper.2.listen to music/ the radio 7.We_______(should)talk in class.8.The book is very_____(help)to us.4.walk home/ to school 9.My sister ______(not watch)TV every day.5.go running/swimming/fishing/boating 10.There____(be)a man and two women there.11.Tom and his father______(live)in Beijing.12.He scores 10______(goal)in 5 ______(比赛).’s team 13.He’s good at_____.He’s a good____(swim).9.play with sb 14.It__________(snow)in winter in China.15.He________(not be)good at drawing.16.He often ____(carry)water for the old man

12.have lots of friends 17._____ he _____(do)his homework at home?

13.know …18.I don’t know the_____(答案)to his questions

14.take the dog for a walk/walk the dog 19.Are there any________(图书馆)in the city?

20.We are the_______(主人)of our country.三、重要句子 21.Is he the______(new)student in your class?

22.One of the________(选手)is from Beijing.23.Our teacher often________(步行)to school.24.Do you know _______(who)bike it is?

25.Who_____(like)football in your class?

5.I usually go half an hour in the 26.Can she_______(understand)your words?

morning.27.She often______(wash)clothes on Sundays.28.______(be)everyone at home now?

初高中数学脱节知识点整理 第3篇

一、现有初高中数学知识存在以下“脱节”

1.立方和与差的公式初中已删去不讲, 而高中的运算还在用.

2.因式分解初中一般只限于二次项且系数为“1”的分解, 对系数不为“1”的涉及不多, 而且对三次或高次多项式因式分解几乎不作要求, 但高中教材许多化简求值都要用到, 如解方程、不等式等.

3.二次根式中对分子、分母有理化初中只简单要求, 而分子、分母有理化是高中函数、不等式常用的解题技巧.

4.初中教材对二次函数要求较低, 学生处于了解水平, 但二次函数却是高中贯穿始终的重要内容.配方、作简图、求值域、解二次不等式、判断单调区间、求最大与最小值、研究闭区间上函数最值等等是高中数学必须掌握的基本题型与常用方法.

5.二次函数、二次不等式与二次方程的联系, 根与系数的关系 (韦达定理) 在初中不作要求, 此类题目仅限于简单常规运算和难度不大的应用题型, 而在高中二次函数、二次不等式与二次方程相互转化被视为重要内容, 高中教材却未安排专门的讲授.

6.含有参数的函数、方程、不等式, 初中不作要求, 只作定量研究, 而高中这部分内容视为重难点.方程、不等式、函数的综合考查常成为高考综合题.

7.图像的对称、平移变换, 初中只作简单介绍, 而在高中讲授函数后, 对其图像的上、下与左、右平移, 两个函数关于原点与轴、直线的对称问题必须掌握.

8.几何部分很多概念 (如重心、垂心等) 和定理 (如平行线分线段比例定理、射影定理、相交弦定理等) 初中生大都没有学习, 而高中都要涉及.

另外, 像配方法、换元法、待定系数法初中教学大大弱化, 不利于高中知识的讲授.

二、初中数学与高中数学衔接知识点整理

1.简单绝对值不等式

2.立方和公式:a3+b3= (a+b) (a2-ab+b2) .

完全平方公式: (a+b+c) 2=a2+b2+c2+2ab+2ac+2bc.

完全立方公式: (a±b) 3=a3±3a2b+3ab2±b3.

3.分解因式

(1) 把一个多项式化成几个整式的积的形式, 这种变化叫做把这个多项式分解因式.

(2) 方法: (1) 提公因式法, (2) 运用公式法, (3) 分组分解法, (4) 十字相乘法.

4.关于方程ax=b解的讨论

(2) 当a=0, b≠0时, 方程无解;

(3) 当a=0, b=0时, 方程有无数解;此时任一实数都是方程的解.

5.一元二次方程:ax2+bx+c=0 (a≠0)

6.函数

(1) 一次函数的图像及性质

(1) 正比例函数y=kx的图像是经过原点的一条直线.

(2) 在一次函数中, 当k<0, b<0时, 则经二、三、四象限;当k<0, b>0时, 则经一、二、四象限;当k>0, b<0时, 则经一、三、四象限;当k>0, b>0时, 则经一、二、三象限.

(3) 当k>0时, y的值随x值的增大而增大;当k<0时, y的值随x值的增大而减小.

(2) 二次函数

(2) 顶点式:y=a (x+m) 2+k (a≠0) , 对称轴是x=-m, 顶点是 (-m, k) ;

(3) 交点式:y=a (x-x1) (x-x2) (a≠0) , 其中 (x1, 0) , (x2, 0) 是抛物线与x轴的交点.

unit1知识点整理 第4篇

disability n. 无力，无能，残疾

Does this disability make it difficult for them to do some things? 这种残疾对他们做某些事造成了困难吗？

His disability prevents him from holding a job. 他的无能使他不能胜任工作。

【拓展】

disable vt. 使失去能力，使残废

The accident disabled him from walking.

=He was disabled from walking by the accident. 那次车祸使他失去了走路的能力。

Old age disabled him for hand labor. 年迈使他失去了劳动能力。

disabled adj. 残废的，有缺陷的

the disabled 残疾人(表一类人)

Because he is disabled, his house has become a prison to him. 因为残疾，房子对他来说简直成了监狱。

This boss is encouraged to hire the disabled. 这位老板被鼓励去雇佣残疾人。

2. Why disabled people find the website beneficial? 为什么残疾人认为这个网站有益？

beneficial adj. 对……有益的、有好处的，其后常接介词to

Fresh air is beneficial to our health. 新鲜空气有益健康。

Sunshine and moisture are beneficial to living things. 阳光和水分于生物有益。

【拓展】

benefit v.有益于

benefit by/from 得益于

I have benefited a lot from extensive reading. 广泛阅读使我受益匪浅。

We benefit by/from daily exercises. 每天锻炼对我们有好处。

I don’t think my uncle will benefit us with his money. 我想我叔叔是不会给我们钱的。

beneficial = of benefit (benefit n.)

This project is of great benefit to everyone. 这项工程对每个人都大有好处。

It was achieved with the benefit of modern technology. 借助现代技术，目标已经达到。

3. She is proud to have taken part in competitions and to have broken a record by running two laps(800metres) this year. 多次参加比赛，在今年的800米赛跑中打破一项记录，她对此感到自豪。

to have done是动词不定式的完成形式，表示不定式的动作发生在谓语动词动作之前。

The old woman seems not to have eaten anything. 这个老太太似乎没吃过东西。

Charles Babbage is generally considered to have invented the first computer. 查尔斯·巴别基被普遍认为是电脑的发明者。

【拓展】

在would like, would love, would rather, hope, wish, expect, think, suppose, want, plan, agree, mean, try等这类表示“打算，意图”的动词后接不定式的完成时作宾语，含有“想做而未做的事情”之意。

I would love to have gone to the party last Sunday evening, but I had to work extra hours to finish my composition. 我本打算上周日晚去参加聚会，然而我不得不抽空完成我的作品。

I planned to have attended the lecture yesterday morning, but my uncle called and I couldn’t get away. 昨天上午，我本计划出席这次演讲，但我叔叔找我，脱不开身。

4. So sometimes some children in my primary school would laugh, when I got out of breath after running a short way or had to stop and rest halfway up the stairs. 跑了很短一段之后，我就会喘不过气来，或者上楼梯上到一半就得停下来休息，我上小学时有的孩子见到我这样就会笑话我。

out of breath 上气不接下气

Tom ran faster than ever, reaching Zhongshan Park quite out of breath. 汤姆跑得比以前更快，到中山公园时已经上气不接下气。

The mile run left Bill out of breath. 一公里赛跑，跑得比尔上气不接下气。

【拓展】

draw/take a breath 深深地吸一口气

hold one’s breath 屏住呼吸

catch one’s breath 喘息

save one’s breath 不白费唇舌

below one’s breath 压着嗓子，低声地

stop one’s breath 把某人闷死

in a breath 一口气，一举

The driver took a deep breath and dived in the swimming pool. 那潜水员深深地吸了一口气，然后跳入泳池中。

Save your breath, the boss will never give you a day off. 别白费唇舌了，老板决不会给你一天假。

5. In particular I wonder if you have considered the following things. 尤其是以下几点我不知道你是否考虑到了。

in particular = especially or particularly尤其，特别，格外

He loves science fiction in particular. 他特别喜爱科幻小说。

Peter was lying on the sofa doing nothing in particular. 彼得躺在沙发上，无所事事。

【拓展】

in trouble 处在困境/不幸/烦恼中

in a dilemma 在(进退两难的)困境中

in danger 在危险中

in time 及时，不迟

The building is in danger of collapsing. 这栋建筑有垮塌的危险。

If I don’t get this finished in time, I’ll be in trouble. 我要是不按时完成就倒霉了。

sb be particular about /over sth 某人对某事很挑剔

sth be particular to sb 某事为某人所特有

She is very particular about the clothes. 她对衣着特别挑剔。

Writing is particular to Mary. 写作是玛丽的爱好。

6. As he was not allowed to accompany her to the shops, he wrote out a list of items for her. 因为克莱尔不允许托尼陪她去商店，所以托尼就给她写了一份购物清单。

accompany v. 陪伴，陪同，伴随；为……伴奏

I will accompany Professor Li to the station. 我要送李教授去车站。

The pianist accompanied the singer. 钢琴家为歌唱者伴奏。

【拓展】

accompany sb to sp 陪……去……

be accompanied by/with 与某事物同时存在或发生，兼带，附有

accompany sb at/on sth 用……给某人伴奏

His wife accompanied him on the trip to New York. 他夫人陪他去纽约。

Lightning usually accompanies thunder. 闪电通常伴有雷声。

The well-known singer was accompanied at the piano by Mr Wang. 王先生为那位著名的歌星担任钢琴伴奏。

keep sb company 陪伴，和某人做伴

in the company of/in sb’s company 在……的陪同下

I feel happy in your company. 有你陪同我很高兴。

7. Claire thought it was ridiculous to be offered sympathy by a robot. 克莱尔觉得受到机器人的同情是荒唐的。

sympathy n. 同情心，同感，慰问

have /feel sympathy for /towards sb 同情某人

in sympathy with 同情，赞成，一致

He has no sympathy with them in their suffering. 他不同情他们的苦难。

On this point I’m in sympathy with him. 在这一点上我同他一致。

【拓展】

in/with sympathy同情地

a letter of sympathy 慰问信

She looked at the poor kids with sympathy. 她同情地看着那些可怜的孩子。

8. Do you think it is possible for a robot to have its own needs and desires? 你认为机器人有可能有自己的需求和渴望吗？

desire n. 愿望，欲望，要求

have a strong desire to do sth 迫切想做某事

have no desire for sth 对……没有欲望

do sth at sb’s desire 应……的要求做某事

He has a strong desire to succeed. = He has a strong desire for success. 他渴望成功。

I will do it at your desire. 我按照你的要求去做。

【拓展】

desire v. 愿望，欲望，要求

desire for sth 渴望得到

desire to do sth 迫切希望做

desire sb to do sth 迫切希望某人做

desire that+主+(should)+动词原形 (虚拟语气)

She desires you to come at once. = She desires that you come at once. 她希望你立即来。

We all desire happiness and health. 我们都希望幸福和健康。

We always desire to live in peace with our neighbors. 我们一向希望邻里之间和睦相处。

【拓展】

desire, hope, want与 wish

desire 强调主观愿望的热切，带有尽力争取的含义；

hope 除表示“希望”外，兼有“打算”的含义；表示对愿望的可能实现抱有信心；

want 是个常用词，只能说want to do sth或want sb to do sth，不可带宾语从句；

wish 多表示不大可能实现的愿望，或用于祝愿语，后面可以跟宾语加宾补形式，hope则不可以。

We all desire happiness and health.

I hope I can pass the exam.

I don’t want Linda to hear about this.

I wish I were a bird.

9. In 1942 he joined the staff of the Philadelphia Navy Yard as a junior chemist and worked there for three years. 1942年，他开始在费城海军造船厂担任初级化学师，在那儿干了三年。

junior adj. 年少的，资历较浅的，等级较低的。一般不用于比较等级，不与than 连用，而应与介词to搭配。反义词senior用法与junior相同。

He is three years junior/senior to me. = He is junior/senior to me by three years. 他比我小/大两岁。

Junior缩写为Jr或Jun，置于与其父亲同名的男子的姓名之后，表示“较年幼的，较小的”。

Mr King Junior is in charge of the factory. 小金先生掌管那个工厂。

Tom is studying at a junior middle school. 汤姆正在上初中。

【拓展】

Junior 还可做名词，意为“年少者，晚辈，三年级学生”

an office junior 初级职员

Of the two clerks, he is the junior.

这两个职员中，他职位较低。

She married a man seven years her junior/senior. 她嫁给了一个比她小/大七岁的男人。

10. But even though Tony had been so clever,he would have to be rebuilt — you can not have woman falling in love with machine. 但是，尽管托尼很聪明，他还得做一番改造——总不能让女人与机器相爱吧。

have sb doing sth 让某人做某事(现在分词表主动进行)

The show had us laughing all the time. 这场表演使我们自始至终笑不停。

I tried to have my son learning English. 我想让我的儿子学英语。

have sb doing sth若用在否定句中，have则有“容忍”之意。

I won’t have you speaking to your dad like that. 我不允许你和你父亲那样讲话。

【拓展】

have sth done

有意识的行为，have意为“使，让，命令”，使某事由别人做

When did you have your hair cut? 你什么时候理的发？

I must have this suit dry-cleaned. 我必须把这套衣服送去干洗。

无意识的行为，have意为“受到，遭到”

Tom had his leg broken while playing football. 汤姆踢足球时伤了腿。

He had his money stolen yesterday. 昨天他的钱被偷了。

have sb do sth

I will have him mend this radio. 我会请他为我修收音机。

I had him write a letter to my employer. 我要他写一封信给我的雇主。

1. It is said that dogs will keep you for as long as you want when you are feeling lonely.

A. safety B. company C. house D. friend

2. I have absolutely no for students who get caught cheating in exams.

A. connection B. sympathy

C. confidence D. emotion

3. We desire that we of any change in plans.

A. are informedB. must be informed

C. be informedD. have been informed

4. If the father is called Smith Senior, the son is usually called Smith .

A. young B. elderly C. Junior D. kid

5. Nuclear science should be developed to the people rather than harm them。

A. contribute B. protect

C. affect D. benefit

6. Mary的父母不在，所以我想我得过去陪着她。

Mary’s parents are away for the week, so I thought I’d go over and . (accompany)

7. 她对吃的东西特别挑剔。

She is what she eats. (particular)

8. 你晚饭有什么特别想吃的吗？

Is there you’d like for dinner? (particular)

9. 我上气不接下气地跑到电影院。

I ran to the cinema all along and

. (breath)

10. 他比我小五岁。

He is five years younger than me. =He is five years me. (junior)

11. 被选为班长我很骄傲。

I am proud to monitor. (elect)

12. 时光一去不复返。

It was impossible for lost time to .(make)

1～5. BBCCD

6. keep her accompany

7. particular about

8. anything in particular

9. out of breath

10. junior to

11. have been elected

unit1知识点整理 第5篇

be good to old people.对老人要亲切。【发散思维】

be good for：适于„, 对„ 有好处

do good to sb.：对„有益，相当于do sb.good e.g.She is good to the little girl =she is kind to the little girl The food is good for our health =The food does good to our health =The food does our health good Add up your score and see how many points you can get.把你的得分加起来, 看一看你能得多少分。

I.add up 加起来

add the figures up / together.把这些数字加起来。【发散思维】 add „to„ ：添加

Add more salt to the soup and the soup will taste better.向汤里再加点盐，汤的味道就会更好。add to ：to increase增加 Bad weather adds to our difficulty 坏天气增加了我们困难。

add up to : to amount to总计，加起来等于 The figures add up to 1000 这些数字总计为1000。

II.score n.（比赛等的）得分；（考试等的）分数，成绩；二十

e.g.The score of the football game is 5—0 这场足球比赛的比分是5 比0。【精彩总结】

1）score 与 dozen 与具体数字以及与many, a few, several等连用时，均不加“S”。score 后常带有of, 而dozen 则不接of。

e.g.There are three score of students in the classroom.教室里有60 名学生。There are three dozen students here 这里有36 名学生。

注意：当 score 与 dozen 后面的名词被 the，these，those 或形容词性物主代词修饰，表示的是整体中的一部分时，score 与dozen 后面都要接of + the +可数名词复数。e.g.Three score of the students are girls Three dozen of the students are boys

2）表示不确定的概念时，经常采用scores of 和 dozens of 来表示许多的，大量的，只修饰可数名词复数。She has been to Beijing scores of times.她去过北京好多次。【趁热打铁】

The woman feeds several _______ hens in her chicken farm.A.scores of

B.scores

C.score of

D.score [答案：C] 3 You will go without your friend 你不带你的朋友去。go without： 没有…也行 ；没有…也勉强能应付 e.g.The man can’t go without cigarettes.这人不吸烟不行。【趁热打铁】

There is no money for a holiday this year;we’ll have to _______ it.A.go on

B.go over

C.go without

D.go for [答案：C] 4.When he /she borrowed it last time, he /she broke it and you had to pay to get it repaired.他/她上次借用你的摄像机时，把它弄坏了，你必须付钱修理。I.pay 付款

She paid the driver and got out of the taxi.她付钱给司机后下了出租车。

【同义词辨析】pay, cost, take, spend pay 其主语是人，常用于pay for结构中。

cost 常用事物作主语,一般不用于被动式。后面可接双宾语。take 常用于It takes sb.some time to do sth.spend 常用于spend „ in(doing sth.)或on sth.结构中。【趁热打铁】

1）The pen ______ me three dollars.2)I ______ three dollars on the pen.3)I _______ three dollars for the pen.4)It _______ them three months to build the bridge.[答案：1）cost;2)spent;3)paid;4)took ]

II.get it repaired ：get sth.done;相当于have sth.done.The washing machine doesn’t work.I’ll get it repaired.洗衣机坏了，我得找人修理一下。

还可用于get sb.to do sth.和get sb.doing sth.结构中。【趁热打铁】

1）Let me try now.I’ll get the car ______(go).2)When are you going to get your hair ______(cut).3)I’ll get him ______(do)the work.[答案：1）going;2）cut;3)to do ] 5.You will tell your friend that you are concerned about him /her but you have to go to class.你会告诉你的朋友你为他/她而担心，但是你必须去上课。be concerned about ：be worried about 为„而担心 We’re all concerned about her safety.我们都为她的安全担忧。【发散思维】

concern n.担心，挂念，后常跟about /for。

She showed a lot of concern for her daughter’s illness.她非常担心她女儿的病情。

vt.(事情)与„有关；使操心

That doesn’t concern us.那与我们无关。

6.You friend has gone on holiday and asked you to take care of his or her dog

你的朋友去度假了，要你照顾他/她的狗。take care of 照顾照看，相当于look after The children are taken good care of in the nursery school.孩子们在托儿所里受到良好的照顾。

take care 单独用表示 “小心”，“当心”，相当于look out/be careful e.g.Look out(take care;be careful)！Here comes the bus.7.While walking the dog, you were careless and it got loose and was hit by a car.在遛狗时，你不小心，狗没了缰绳的束缚，被车撞着了。

I.walk vt.遛（动物）；陪（人）步行

Grandpa walks the dog every day.爷爷每天都去遛狗。

I’ll walk you to the station.我陪你走到车站。

II.while walking the dog : 相当于while you were walking the dog 的省略。

You were too careless while(you were)driving.你开车时太粗心大意了。III.loose: 未系着的，解除束缚的 The horses were loose in the field.那群马在原野中被解除了缰绳。8.tell him /her to look at someone else’s paper.告诉他/她看其他人的试卷。

else adj.其他的，其余的

e.g.I want to tell you something else.我想告诉你其他事情。

Who else wants to go?

还有谁想去？

【同义词辨析】else, other, rest else 常用在疑问词和不定代词之后，后可加’s 表示所属关系。

other 通常放在名词前面作定语，也可当作代词使用。

rest 通常与the 连用，后常有of短语，the rest 相当于代词。

【趁热打铁】

1）We need ten _______ chairs.2)There are ______ ways of doing this exercise.3)This must be someone ______ fault.4)Where ______ did you go? 5）Five of them are from England, and _______ are from the U.S.A.[答案：1）other;2)other;3)else’s;4)else;5)the rest/the others] 【点击高考】

－I hear they aren’t pleased with the house you’ve chosen for them.－Well ,_______ could they live in such comfort? [NMET 2003北京，27]

A.Where else

B.what else

C.how

D.why

[答案：A] 9.Make a list of reasons why friends are important to you I.reason n.原因, 理由

What is the reason for your being late? 【同义词辨析】reason, cause, excuse

reason 指以理解某事而提出的理由，与所发生的事情不一定有逻辑上的因果关系，经常与for 连用，来表示“„的原因”。

cause 指直接导致事情发生的起因，与所发生的事情有因果关系，经常与of 连用，来表示“„的起因”。

excuse 指推卸责任而寻求的理由、借口。【趁热打铁】

1）The ______ of the fire was carelessness.2)He refused to explain his ________.3）He made a good ______ for breaking the regulation.[答案：1）cause;2)reason(s);3）excuse] II.the reason why friends are important to you

朋友对你很重要的原因

e.g.The reason why he was late is that he got up late

他来晚的原因是他起床晚了。【趁热打铁】

The reason _______she was absent is ______ she was ill.A.why;because B.for which;because C.why;that

D.for that;because [答案：C] 【点击高考】

－I’m sorry I stepped outside for a smoke.I was so tired.－There is no ______ for this while you are on duty.[NMET 2003北京，29] A.reason

B.excuse

C.cause

D.explanation [答案：B 在值班过程中，任何不符合规定的所谓“理由”都是一种“借口”。]

10.What do you think a good friend should be like? what is sb / sth.like? “ „什么样?” 可以问(人的)外表，也可以问（人的）品质

e.g.－ what is Mike like?

高一英语必修二unit1知识点 第6篇

1. There is no doubt that 毫无疑问

2. when的用法

was/were doingwhen 正在做某事这时

was/were about to do when. 将要做某事这时

had just donewhen 刚做完某事这时

3. China is larger than any other country in the world. (同一范围内的比较)

She runs faster than any man in Greece. (不同范围内的比较)

4. the way的用法

The way___ he explained to us was quite simple. (that/which/省略)

The way ___ he explained the sentence to us was not difficult. (that/in which/省略)

5. worth的用法

be (well) worth doing sth (很)值得做某事

be worthy to be done = be worthy of being done

It’s worthwhile to do sth = it’s worthwhile doing sth

6. “疑问词+ to do” 结构，在句中做主语、宾语、表语

How to do it is a question.

I don’t know what to do next.

7. it做形式主语

It has been proved that pride goes before a fall.

事实证明骄必败。

8. what 引导主语从句，在从句中作主语

What he has said is of great importance.