use的用法小结
1. used to do sth.意为"过去常常做某事"，它表示过去经常发生的动作或存在的状态，而现在已不再发生或存在。这个短语含有今昔对比之意，其否定形式常用used not to或didn't use to。反意疑问句中应该用did/didn't或used/usedn't。例如：
I used to swim in this river when I was young.我年轻时常在这条河里游泳。
They used to be good friends, didn't they他们过去是好朋友，是吗
2. be used to sth. / doing sth.意为"习惯、适应某事/做某事"，它表示习惯于某一客观事实或状态，其中to是介词，后面跟名词、代词或动名词；be used可用于多种时态；如强调动作可用get或become替换be。例如：
Old people are used to getting up early in the morning.老年人习惯早晨很早起床。
I wasn't used to city life, but now I have got used to living in this city.我以前不习惯都市生活，但现在我已习惯住在这座城市了。
3. be used to do sth.意为"被用来做某事"，其中use表"使用"之意，是被动语态形式，to是动词不定式符号。例如：
Wood can be used to make paper.树木可以用来造纸。、
4. be used for...意为"被当做……",其中use表"使用"之意，是被动语态形式。例如：
The seal's fur can be used for coats.海豹皮可当做大衣用。
5. be of use意为"有用的"，其中use是名词，可用形容词来修饰。例如：
The dictionary is of great use to the students.这本字典对学生们很有用。
6. be in use意为"在使用"，其中use也是名词。例如：
The laboratory is in use until three o'clock.实验室一直到3点钟都有人使用。
7. make use of sth.意为"利用、使用某物"，其中use也是名词，可用good, full, more, little等形容词来修饰。同学们应特别注意它的被动形式。例如：
We must make full use of time to study.我们必须充分利用时间学习。
8. use与for或as连用，构成短语use...for，意为用来做......；为了......而使用，use... as ...... 为作为......使用；用作......之意。Bamboo can be used for carrying water. 竹子可以用来运水。
Modern cellphones are more than just phones-they are being used as cameras and radios, and to send e-mail or surf the Internet. 现代手机不仅仅是电话，它们也当作照相机和收音机使用，还可以发送电子邮件或上网。
9. use up用完；用光。
All the paper has been used up. 纸都用完了。
7. You will ________ living in the country.
8. We ________ go there every year when I was young.
9. People ________ coal to cook and heat.
10. There ________ be a free market in this village.
II.用方框中所给词或词组的适当形式填空。
use, be used to, get used to, used to
1. Once you ________ smoking, you can hardly stop it.
2. He ________ Chinese tea five years ago when he was in China.
3. A tape-recorder can ________ record your voice.
4. We ________ live in the city, but now we live in the countryside.
5. This machine ________ make farm tools.
6. I prefer not to go there by plane. I ________ (not) flying.
7. It was a bit of shock: I ________ (not) paying so much for a Beijing roast.
8. The medicine ________ externally only.
9. A new production line has been put ________ in this factory since last month.
10. I ________ (not) learning in a noisy situation.
III.单项选择。
1. -Is Paul playing soccer and tennis for theschool
-He ________ . But now he has given them up.
A. is
B. has
C. used to
D. had
2. Bamboo can ________ water, can't it
A. get used to carrying
B. be used to carrying
C. have used to carry
D. be used to carry
3. I'm not used to ________ like that.
A. being spoken to
B. be spoken to
C. spoken to
D. speaking to
you got used to ________ on this kind of computer
-Not yet, because I used to ________ the abacus before.
A. work; use
B. working; use
C. work; using
D. working; using
5. He used ________ on the right in China, but he soon got used ________ on the left in England.
A. to drive; to drive
B. to drive; driving
C. to driving; to drive
D. to drive; to driving
6. Has the boy who was made use of ________ realized his mistake
A. stealing
B. stolen
C. to steal
D. for stealing
7. The old professor said to us every part of the material should be made use of ________ the power station.
A. to build
B. building
C. build
D. built
8. Every possible means ________ to prevent the air pollution,
by的用法小结： 1、介词prep. 在…旁；靠近 · Our teacher was sitting by the window. 我们的老师正坐在窗户旁边。 · Stand by me! 站到我的身旁来！ · We spent our holiday by the sea. 我们在海边度假。 2、介词prep. 经过 · He walked by me without speaking. 他走过我的身旁，没有说话。 · My brother goes by the building every day. 我弟弟每天从这楼旁走过。 3、介词prep. 用；靠；通过 using (showing who or what did something) · I know it by heart. 我把它记在心头。 · They can read by touch. 他们可以通过手摸来阅读。 · By getting up early, I can have an hour for reading English in the morning. 靠起得早，我每天早晨有一小时时间阅读英语。 4、介词prep. 不迟于 not later than · I shall be back by 5 o'clock. 最迟五点我一定回来。 · How many English parties had you had by the end of last term? 到上学期末，你们举行了几次英语晚会？ 5、介词prep. 通过；沿着 through; along; over
· We came through the fields, not by the road. 我们是穿过田野而不是沿那条路来的。· to send a letter by post 通过邮局寄信 6、介词prep. （表示作者）被；由 word that shows the author, painter, etc. · Thirty divided by two is fifteen. 三十除以二得十五。 · The child was saved by a PLA man. 这孩子是由一位解放军战士救活的。 · This bridge was built by the soldiers. 这座桥是士兵们造的。 7、介词prep. （指交通等）乘；用 word that shows what kind of transport, etc. · The man came by bus. 那人是坐公共汽车来的。 · They went to Shanghai by air. 他们坐飞机去上海。 8、介词prep. 在…情况下；在…时间during · Do you prefer travelling by day or by night? 你喜欢在白天还是在夜晚旅行？ 9、介词prep. （表示部分）在…部位word that shows which part · She led the child by the hand. 她拉着孩子的手往前走。 10、副词adv. 在旁边
by 的用法小： 1、介prep. 在?旁；靠近 ·Our teacher was sitting by the window. 我的老正坐在窗旁。 ·Stand by me! 站到我的身旁来！ ·We spent our holiday by the sea. 我在海度假。 2、介prep. ·He walked by me without speaking. 他走我的身旁，没有。 ·My brother goes by the building every day. 我弟弟每天从楼旁走。 3、介prep. 用；靠；通 using (showing who or what did something) ·I know it by heart. 我把它在心。 ·They can read by touch. 他可以通手摸来。 ·By getting up early, I can have an hour for reading English in the morning. 靠起得早，我每天早晨有一小英。 4、介prep. 不于 not later than ·I shall be back by 5 o'clock. 最五点我一定回来。 ·How many English parties had you had by the end of last term? 到上学期末，你行了几次英晚会？ 5、介prep. 通；沿着 through; along; over ·We came through the fields, not by the road. 我是穿田野而不是沿那条路来的。 ·to send a letter by post 通局寄信 6、介prep. （表示作者）被；由
It的用法总结 在英语中,it有许多不同的用法,它既可以用作代词(如人称代词、非人称代词)，也可以用作引导词（作形式主语或形式宾语），还可以用来构成强调句型。 1.it用作代词 (1) 用作人称代词在句子中作主语或宾语；指前面已经提到过的事物、动物或人，且it指特定的事物；如果指前文中提到的事物中的任何一个，用one。one可以与any, each, every, not等连用，但one不可代替不可数名词。 —Where's your car? —It's in the garage. 你的汽车在哪儿呢？在车库里。(指代物品your car) Did you hit it? 你打中了吗？(指代事件) The baby cried when it was hungry.这婴儿饿时就哭。（指代婴儿，尤指性别不详或无所谓时）—Who is that? —It's me. 是谁？我。(指一定情景中所确定的人或事物，此时相当于指示代词，代指this和that,有时也指人) —What's this? —It's a box. 这是什么？一只箱子。 (2) 作非人称代词表示天气、日期、时间、温度、距离、价值、路程、度量、自然现象与环境等。也可模糊地指一般情形或上文的部分或整个意思。译成汉语时，it通常不一定译出来。 It's a long time since they left. 他们走后很久了。 It's two miles to the beach.离海滨有两英里远。 That's just it—I can't work when you're making so much noise.原因就在这里——你弄出这么大的声音，我工作不了。 另外，需要注意两点： （1）“It's time…”后面可以接不定式和介词短语表示“是做……的时候了”。如： It's time for supper. It's time to have supper. (2) “It's time…”后面还可以接一个从句，但是从句中的谓语动词一定要用过去式即虚拟语气，如： It's time we had lunch.是我们吃饭的时候了。 It's time we started.是我们该出发的时候了。 2.it用作引导词 (1) 作形式主语由动词不定式、动词-ing短语或名词性从句担任主语的句子，常用it来作形式主语，而把真正的主语放在句子的后面。 It's not easy for us to learn English well. [句型为: It +be+形容词+（for sb.）to do sth.] It's foolish of you to say that to her. [句型为: It +be+形容词+（of sb.）+to do sth.] It's no use/good/help…sleeping too much. (句型为: It +be+名词+doing) It's important that we be there on time.（句型为: It +be +形容词+that从句） It's high time that Tom went to school. (句型为: It +be +time +that从句，从句中的动词用过去时) It was the second time that he had telephoned me that day. [句型为: It +be+ the first(second, third)time +that从句]（that从句中动词用完成时） +that过去分词: It +be+句型为It was arranged that they should leave the following winter. ( 从句)
by用法的练习题 1. Come and sit _______ （我旁边）. 2. There is a big tree _______ （在河边）. 3. _______________ （到上星期日）I had finished the book . 4. Can you finish the work _____ （在五点之前）. 5. Her mother goes to work ____ bus every morning. A.by B.at C.take D.o n 6.She came home _________ （乘飞机）. 7.Did you make the desk ___________ （自己独自）？ 8.She made a meal for her parents __________ （独自）for the first time. 9. _______________ （顺便问一下）how many people are there in your family? 10. You should know her ______________ （逐渐地）. 11.Ice has been turned into water ___________ （受热）. 12. ________________ （不久以后）more and more people bega n to study En glish . 13. he Great Wall was built ____________ （用手）. 14. He makes a livi ng _________________ （通过教书）. 15. -How do you lear n En glish? -I learn English ________________________ （通过向老师请教的方式）. used to相关用法的练习题 一、翻译 1. 我妈妈习惯早起。 2. 王先生曾经是一位工人。 3. 他过去常常骑自行车上学。 二、用所给单词的适当形式填空： 1. We used to _ （go ）swimming last year. 2.1 am used to ___ （run）every morning. 3. Bamboos are used to _（build） houses there. 4. They have bee n used to ___ （live ） in the coun tryside. 三、根据汉语意思完成句子： 1.1 ___________________ the food here.（我习惯于吃这儿的食物。）
?Never be afraid of grammar ?Collect some examples; ?Watch them very carefully; ?Find out something in common; ?Try to use the rules ---- practise. it用法完全归纳 一、it 作人称代词的用法 1.指事物 作为人称代词，it 可以除人以外的一切事物或动物。如： I dropped my watch and it broke. 我把手表掉在地上摔坏了。 It’s hard work, but I enjoy it. 工作很辛苦，可是我乐意干。 “Where is the dog?”“It’s in the bedroom. ”“狗在哪?”“在卧室里”。 2.指人 it 指人主要用于指不性别不明的婴儿或用于确认某人的身份。如： Is it a boy or a girl? 是男孩还是女孩? There is a knock on the door. It must be the postman. 有人在敲门，一定是邮递员。 【说明】在答语中，常用来指本人，如说It’s me。
3.代替某些代词 代词it 还可用于代替指示代词this, that 以及复合不定代词something, anything, nothing等。如： “What’s this?”“It’s a new machine. ”“这是什么?”“是一种新机器”。 Nothing is wrong, is it? 没出什么问题，是吗? 二、it 作非人称代词的用法 1.基本用法 it 作非人称代词的用法，主要用于指时间、距离、价值、天气、气候及温度等自然现象。如： It’s too late to go there now. 现在去那儿已经太迟了。 It rained all day yesterday. 昨天下了一天的雨。 It can get very hot here. 这里有时会很热。 2.用于某些句型 It’s time for sth. 该做某事了。 It’s time to do sth. 该做某事的时候了。 It’s time for sb to do sth. 某人该干某事了。 It’s (about / high) time + that-从句. 某人该做某事了。(从句谓语用过去式，有时也用“should+动词原形”) It’s first (second) time + that-从句. 某人第几次干某事。(从句谓语用现在完成时)
页脚.
. . 教学过程 一、课堂导入 本堂知识是初中最常见的介词by的一个整理与总结，让学生对这个词的用法有一个系统的认识。页脚.
. . 二、复习预习 复习上一单元的知识点之后，以达到复习的效果。然后给学生一些相关的单选或其他类型题目，再老师没有讲解的情况下，让学生独立思考，给出答案与解释，促进学生发现问题，同时老师也能发现学生的盲点，并能有针对性地进行后面的讲课。 页脚.
. . 三、知识讲解 知识点1： by + v.-ing结构是一个重点，该结构意思是“通过……，以……的方式”，后面常接v.-ing形式，表示“通过某种方式得到某种结果”，即表示行为的方式或手段。 I practice speaking English by joining an English-language club. 我通过加入一个英语语言俱乐部来练习讲英语。 Mr Li makes a living by driving taxis.先生靠开出租车为生。 页脚.
. . 页脚. 介词by + v.-ing 结构常用来回答How do you...?或How can I...?之类的问题。 —How do you learn English? 你怎样学习英语呢？ —I learn English by reading aloud. 我通过大声朗读来学英语。 —How can I turn on the computer? 我怎样才能打开电脑呢？ —By pressing this button. 按这个按钮。 知识点2：by 是个常用介词，其他用法还有： 1【考查点】表示位置，意思是“在……旁边”，“靠近……”，有时可与beside互换。 The girls are playing by (beside) the lake. 女孩们正在湖边玩。 此时要注意它与介词near有所不同，即by 表示的距离更“近”。比较： He lives by the sea. 他住在海滨。 He lives near the sea. 他住在离海不远处。
by的用法小结 1.用于被动语态的句子中,表示动作的执行者,意为“被;由”。 He was praised by the teacher.他受到了老师的表扬。 The book was written by Lu Xun.这本书是鲁迅写的。 2.表示方式、方法、手段等,后常接无冠词的名词或动名词,意为“通过;靠;用”。 Don't judge a person by appearances. 勿以貌取人。 He made a living by teaching.他以教书为生。 3.表示时间,意为“到……时(为止”或“不迟于……”。 He ought to be here by now.他现在应该在这儿了。 By the time he was ten, he had learnt about 1,000 English words.到十岁时,他已学了约一千个英语单词。 4.表示(增减)程度,尺寸数量等,意为“至……的程度”。 the bullet missed me by two inches.那子弹以两英寸之差未击中我。 the rope needs to be longer by two feet.这绳子需要再长两英尺。 5.表示交通路线或工具,后接名词不用冠词,意为“乘;坐”。 go by bus / plane / train 乘汽车(飞机、火车)去 travel by land / sea / air 陆上(海上、空中)旅行 6.表示位置,意为“在近旁;在……旁边”。 There is a pumping station by the river.河边有个抽水站。
It的用法 一、Tell the functions for “it” in each sentence: 1、---What’s the weather together ---It is fine. 2. It is hard to communicate with him. 3. I find it hard to communicate with him. 4. It is Li that who cleaned the classroom. 5. It is a book. 二、It 用法归纳 1，指代it （1）.用作人称代词：指代物、整个句子 （2）用作非人称代词 2，形式it：（1）作形式主语（2）作形式宾语 3，强调it 4，特殊句型 5.在答语中指代this/that： 1).--- Whose book is that ---It’s mine. 三、特别注意： it, one和that作替代词的用法及区别 1. it代替前面提到的同一事物,该事物既可以是可数名词也可以是不可数名词。 (特指，指代单数，指代物，同名同物) Can I borrow your pen—Sorry， I’m using it.
2. one代替前面提到的同类事物中的一个。该事物只能是可数名词,前面可以有冠词,也可以被this、that或形容词修饰,其后也可以有定语。（泛指，指代可数名词，指代人或物，同名异物） I have a bike. Do you have one Eg: (1).I bought a dictionary three years ago and I am still using______ now. (2) I bought a dictionary three years ago but I am going to buy a new _______soon. (3). that代替前面提到的同类事物中特指的一个。该事物既可以是可数名词也可以是不可数名词,必须要有后置定语,但不可以有前置修饰语。（特指，指代单数或不可数，指代物，后面有定语） The coffee produced in Brazil is more famous than __________in Mexico. 四：形式主语、宾语、强调句及其他
介词by用法详解 1.表示场所，意为“在……旁边”“在……近旁”“在……手边”，此时要注意它与介词near有所不同，即by 表示的距离更“近”。比较： He lives by the sea. 他住在海滨。 He lives near the sea. 他住在离海不远处。 2.表示动词执行者，主要用于被动语态，此时要注意它与介词with的区别：by 表示动作的主体，with 表示动作者的手段工具。如： The house was destroyed by fire. 此屋被大火烧毁。（fire是动作的主体，此句的主动形式为Fire destroyed the house.） The house was destroyed with fire. 此屋是（被人）用火烧毁的。（fire只是工具，动作的主体另有其人，此句可认为省略了一个by短语，如by someone之类的，其主动形式可以是Someone destroyed the house with fire.） 3.表示手段或方式等，注意以下用法： (1) 表示“乘”“坐”时，其后接交通工具（如bus, bike, train, plane, car, taxi, ship 等）或与交通工具密切相关的名词（如air, water, land, road等），在句中主要用作方式状语，其中通常不用冠词或其他限定词。如： They came here by the first bus. 他们是坐第一班车来的。 但是，若表示交通工具的名词前插有定语修饰语，则也可以用冠词。如： We’re going by the 9:30 train. 我们坐9:30的火车去。 We went to Shanghai by a large ship. 我们乘一艘大船去上海。 注意，汉语说“步行”，英语习惯上用on foot, 而不用by foot。 (2) 注意以下表示方式的有用表达，其中不用冠词或其他限定词： by phone 用电话by telegram 用电报 by letter 用信件by express 用快件 by air mail 用航空邮件by ordinary mail 用平信 by post 用邮寄by radio 用无线电 by hand 用手工by machine 用机器 注意下面两例用by与用with的区别： The letter was written by hand. 这封信是用手写的（即不是打印的）。（by hand表示一种抽象的手段，是无形的，注意其中没用冠词或其他限定词）
It's time…用法归纳 It's time…句型是中学英语里使用频率较高的句型，其意为“该是……的时候了”。用法灵活多变，也是大家以掌握的句型。现就其有关句式归纳如下： ⑴ It's time for + n.“该是（干）……的时候了。”例： Boys and girl, It's time for class. 同学们，该上课了。 ⑵ It's time + (for sb.) to do sth. .表示“该是（某人）干……的时候了。”例： It's time for you to clean the classroom. 该是你打扫教室的时候了。 It's time to go to school. 该去上学了。 ⑶ It's time + that clause 时，that可省略，time可由high,about修饰，从句中的谓语动词有两种形式，或者用动词的过去式(be用were)；或者用shoud + 动词原形（should不能省略)。此句型为虚拟语气句型，表示“现在某人该做某事了”。含有该事早该去做而未做，现在去做似乎都为时已晚的意思。例： It's time （that）we went to bed. 我们该去睡觉了。 It's high time that the article were published. 发表这篇文章是适时的。 It's time you should do cleaning. 你该去打扫卫生了。 4) It's + the+序数词+ time+ that clause.也表示某人第几次做某事。例： It is my first time that I've even written letters. 这是我第一次用写信。
由ｂｙｄｏｉｎｇｓｔｈ．结构谈介词ｂｙ的用法 作者：康俊民 在新目标九年级教材Unit1中有这样的句子： —How do you study for a test? —I study by working with a group. 这句话中by是介词，用来表示方法、手段、方式，意为“凭借；靠；用；通过”，后接动词的-ing形式。例如： They learn English by watching TV. 他们通过看电视学英语。 He succeeded by working hard. 他由于工作努力而获得了成功。 以下是by的其它基本用法归纳： 1. 表示静态的位置，意为“靠近……；在……旁边”。例如： His house stands by the river. 他住在河边。 2.表示动态的位置，意为“从……旁边经过”、“路过……”。例如： He passed by me without greeting me. 他从我身边走过，但 没和我打招呼。 3.表示时间、时限，意为“不迟于；在……之前”、“到……时 为止”。例如： They will be back by six. 他们将于6点钟以前回来。 4.和take, hold等动词连用，表示接触身体/物体的某一部 位。例如： Don’t take the baby by the arm. She is too young. 别拽那个 小孩的胳膊，她太小了。 5.表示“逐个”、“逐批”之意，常见于以下短语中： step by step 一步一步地；day by day 日复一日地；little by little一点一点地。 6.用于被动语态中，后接动作的执行者，表示“被……”、“由……”。例如： English is spoken by many people. 许多人讲英语。 7.表示判断的标准，意为“依照，根据”。例如： By my watch it is eight o’clock. (按)我的表显示的时间是八点。
I t的用法总结文档编制序号：[KKIDT-LLE0828-LLETD298-POI08]
It 的用法总结 一. 代词: 1)指代上文 2)指代this/that 3)指代未知性别的婴儿或孩子或身份不明的人 4）指代时间/地点/天气/温度/距离/环境 gets dark very early in the winter. will you call it if it’s a boy love spring---It’s a wonderful time of the year. ’s less than 100 kilometres from here to Jinan. the factory closes, it will mean 500 people losing their jobs. ’s this It’s a cat. has snowed much this year. (1)The book in your bag is very interesting. Can I borrow (2) The book in your bag is more interesting than ______ on the desk. (3) The weather here is much colder than____ in Nanjing. (4) The books are free. You can take____ free of charge. (5) The books in the bag are better than _____ on the desk.
it的用法总结 :用法英语中it的用法总结 it的用法总结高中 it的用法总结小学 篇一:it的用法归纳 ? Never be afraid of grammar ? Collect some examples; ? Watch them very carefully; ? Find out something in common; ? Try to use the rules ---- practise. it用法完全归纳 一、it 作人称代词的用法 1. 指事物 作为人称代词，it 可以除人以外的一切事物或动物。如: I dropped my watch and it broke. 我把手表掉在地上摔坏了。It’s hard work, but I enjoy it. 工作很辛苦，可是我乐意干。“Where is the dog?” “It’s in the bedroom. ” “狗在哪?”“在卧室里”。 2. 指人 it 指人主要用于指不性别不明的婴儿或用于确认某人的身份。如: Is it a boy or a girl? 是男孩还是女孩? There is a knock on the door. It must be the postman. 有人在敲 门，一定是邮递员。 【说明】在答语中，常用来指本人，如说It’s me。 3. 代替某些代词
代词 it 还可用于代替指示代词this, that 以及复合不定代词 something, anything, nothing等。如: “What’s this?” “It’s a new machine. ” “这是什么?”“是一种新机器”。 Nothing is wrong, is it? 没出什么问题，是吗? 二、it 作非人称代词的用法 1. 基本用法 it 作非人称代词的用法，主要用于指时间、距离、价值、天气、气候及温度等自然现象。如: It’s too late to go there now. 现在去那儿已经太迟了。 It rained all day yesterday. 昨天下了一天的雨。 It can get very hot here. 这里有时会很热。 2. 用于某些句型 It’s time for sth. 该做某事了。 It’s time to do sth. 该做某事的时候了。 It’s time for sb to do sth. 某人该干某事了。 It’s (about / high) time + that-从句. 某人该做某事了。(从句谓语用过去式，有时也用“should+动词原形”) It’s first (second) time + that-从句. 某人第几次干某事。(从句谓 语用现在完成时) It’s + 时间段 + since-从句. 自从……有一段时间了。 It’s + 时间段 + before-从句. 过多长的时间才…… 三、it用作形式主语 1. 基本用法
" It" 做形式宾语用法总结 当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时，为保持句子结构平衡，避免句式结构的混乱，常用it作形式宾语，而将真正的宾语放在句尾，构成“动词＋it＋宾语补足语＋不定式（动名词或从句）”结构，也可称作“6123结构”。此时it仍只起先行引导作用，本身无词义。它可以代替三种形式：不定式、动名词和宾语从句。 it作形式宾语时，需具备两个条件：①真正的宾语是不定式、动名词或从句; ②有宾语补足语，具备了这两个条件，形式宾语it一定要用。 ⒈ it代替不定式短语think/ find/ feel/ consider/ make/ regard…+ it +形容词/名词+ 不定式短语如： ①I find it pleasant to work with him. (it 作形式宾语，代替不定式短语to work with him) ②They felt it difficult to finish the work in such a short time. （it 作形式宾语，代替不定式短语to finish the work in such a short time） ③She thinks it her duty to help us. （it 作形式宾语，代替不定式短语to help us） ④I think it my honor to be invited to speak here. （it 作形式宾语，代替不定式短语to be invited to speak here） ⑤Tom didn’t find it difficult to write letters i n Chinese. （it 作形式宾语，代替不定式短语to write letters in Chinese） ⑥All these noises made it impossible for me to go on with the work. （it 作形式宾语，代替不定式短语to go on with the work） ⒉ it代替动名词短语( 这只限于少数句型，在多数情况下用不定式时更多一些) 如： ①The professor considers it no good reading without understanding. ②Do you consider it any good trying again? ③He found it useless( no use) arguing with him. ④He thought it absolutely senseless attempting the impossible. ⑤I don’t think it worthwhile going to such a place. ⒊ it代替宾语从句： 如： ①We all thought it a pity that the conference should have been cancelled. ②I took it for granted that they were not coming. ③I’ll see to it that everything is ready in time. “it”的特殊用法常出现在以下几种结构中。 A. 动词＋it＋when / if 从句。常见于appreciate, enjoy, like, dislike, love, hate, prefer等少数动词之后。 We would much appreciate it if you could do us that favour. I'd prefer it if I didn't have to finish the work. B. 动词+ it + that从句。常见于like, take, have, put等少数动词之后（it相当于that从句的同位语）。 I take it that they will succeed sooner or later. The newspapers have it that some Japanese firms have gone bankrupt. Rumor has it that Mary is getting married. I take it that you have been out. Let me come and stay. You can put it that it was arranged before.
BY 一、用作介词 1．表示方式、方法或手段，意为“使用某物；靠；乘（车、船）”等。例如： —How do you learn English? 你是怎样学英语的？ —I learn by studying with a group. 我是通过和小组一起来学习的。 I go to work by train every day. 我每天乘火车去上班。 Turn on the computer by pressing this button. 按这个按钮就可启动计算机。 2．表示移动方向，从某人或某地的一边到另一边，意为“沿，经，从……旁边过”。例如：He walked by me without speaking. 他从我旁边经过，没有说话。 I walk by his home every day. 我每天都从他家门口经过。 3．表示时间，意为“不迟于；在……以前；到……为止”。例如： I want to get there by eleven o'clock. 我想在十一点前赶到那里。 You'd better finish the work by six. 你最好在六点钟之前完成这项工作。 4. 用于被动语态中，表示动作的主体，意为“由；被”。例如： This book is written by Lu Xun. 这本书是鲁迅写的。 The thief was caught by a policeman. 那个小偷被警察抓住了。 5．表示位置，意为“靠近，在……旁边（附近）”。例如： Who is the old man by the lake? 湖边的那位老人是谁？ The telephone is by the door. 电话机在门旁边。 6．表示度量、准则和标准。例如： We buy material by the meter. 我们买材料用米来计算。 He does everything by rule. 他总是按规定办事。 7．表示被抓着、被接触的身体的某一部分，意为“抓；拉”。例如： She took me by the hand. 她拉住我的手。
高考英语语法知识之It 的用法总结 1．It is + 被强调部分+ that ... 该句型是强调句型。将被强调的部分放在前面，其它部分置于that之后。被强调部分可以是主语，宾语，状语。强调的主语如果是人，that可以由who换用。 如果把这种句型结构划掉后，应该是一个完整无缺的句子。这也是判断强调句型与其它从句的方法。 It was they that (who) cleaned the classroom yesterday. It was in the street that I met her father. 2．It was not until + 被强调部分+ that ... 该句型也是强调句型。主要用于强凋时间状语，译成汉语＂直到．．．才．．．＂，可以说是not ... until ... 的强调形式。 It was not until she took off her dark glasses that I realized she was a famous film star. = Not until she took off her dark glasses did I realize she was a famous film star. = I didn’t realize she was a famous film star until she took off her dark glasses. 3．It is clear ( obvious, true, possible,certain....) that ..... 该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为＂清楚（显然，真的，肯定．．．）＂是主语从句最常见的一种结构。 It is very clear that he’s round and tall like a tree.= That he’s round and tall like a tree is very clear. 4. It is important ( necessary, right, strange, natural...) that ... 由于主句中的形容词不同，that 后的从句中要用虚拟语气（should + 动词原形），should 可以省去。 It is important that we (should) learn English well. It is necessary that he (should) remember these words. 5. It is said (reported, learned....) that ... 该句型中的it 仍是形式主语，真正主语是that 引导的主语从句。该结构常译为＂据说（据报道，据悉．．．）＂。It is said that he has come to Beijing. 6. It is suggested ( ordered ... ) that ... 主句中的过去分词是表示请求，建议，命令等词时，that后的从句要用虚拟语气（should + 动词原形），should 可以省。常译为＂据建议；有命令．． It is suggested that the meeting ( should ) be put off. It was ordered that we ( should ) arrive there in two hours. 7. It is a pity ( a shame ... ) that ... 该句型中，that后的从句一般用虚拟语气（should + 动词原形），should可省去．表示出乎意料，常译为＂竟然＂。没有这种意义时，则不用虚拟语气。 It is a pity that such a thing ( should ) happen in your class. It is a pity that he is ill. 8. It is time ( about time ,high time ) that ... 该句型中that 后的从句应该用虚拟语气，值得注意的是①常用过去时态表示虚拟．②有时也用should + 动词原形，should 不能省。常译为＂是（正是）．．．的时侯．．．＂。 It is time that children should go to bed. = It is time that children went to bed. 9. It is the first ( second ... ) time that ... 该句型中的that 从句不用虚拟语气，而用完成时态。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后面从句用现在完成时态；如果是一般过去时，后面从句则用过去完成时态。该结构中that 可以省去；it有时用this / that 替换．常译为＂这是某人第几次做某事了＂。 It is the first time I have been here. = This is the first time I have been here. 10 It is the +形容词最高级+ 名词+ that + ….. 该句型中的that 从句不用虚拟语气，而用完成时态。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后面从句用现在完成时态；如果是一般过去时，后面从句则用过去完成时态。该结构中that 可以省去；it有时用this / that 替换．常译为＂这是某人做过的最…的事情＂。