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九年级英语：When was it built

初中英语新课程标准教材

英语教案( 2019 — 2020学年度第二学期 )

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英语教案 / 初中英语 / 九年级英语教案

编订：XX文讯教育机构

When was it built

教材简介:本教材主要用途为通过学习英语的内容，提高学生的语言技能，增加一项语言能力，有利于国际化的日常交流、生活、工作等，本教学设计资料适用于初中九年级英语科目, 学习后学生能得到全面的发展和提高。本内容是按照教材的内容进行的编写，可以放心修改调整或直接进行教学使用。

教学目标

1．学习一些公共场所的标志和说明，要能正确理解，规范自己的行为。

2．掌握本单元的词汇，特别是一些短语的用法。

3．进一步复习一些电话用语和电话对话中时态的综合运用。

4．进一步学习被动语态，特别是一般过去时态的被动语态谓语动词形式，它的肯定式、否定式、疑问式及其答语等。

5．认真学习"A visit to the Natural Museum"，掌握一些有关dinosaur的常识，丰富自己的背景知识。

6．能运用所学句型及语法结构来谈论某些物品的制作、产地和作用以及制成材料的日常用语。

教学建议

教材内容分析

本单元主要围绕学习方向和常见的标志语，以及对话（打电话）的方式学习了“询问……”的表达法，学习了一些地点、建筑物和机构的名称，学习了一些常用的词、短语和句型，通过对话的方式学会如何谈论展品。通过课文“A visit to the Natural History Museum”，很自然地引出了一般过去时态的被动语态。讲述了一般过去时态的被动语态的构成，它的肯定、否定和疑问句式及其简略答语。通过本单元的学习，我们要掌握一些有关dinosaurs的常识，来丰富自己的一些短语和习惯用语。

本单元的短语和习惯用语

(一) 短语与词组

1. in town 在城里

2. on show 陈列，展出

3. hundreds of 成百上千的

4. the way to 到……的路

5. on display 展出，陈列

6. a visit to…一次去……的参观

7. be interested in 对……感兴趣

8. a group of 一群，一组，一对

9. in the 1920s 在二十世纪二十年代

10. long long ago 很久以前

11. long before 远在……以前

12. That’s a pity 很遗憾

13. on the earth 在地球上

14. be covered with 用……覆盖

15. the feathered dinosaurs 长有羽毛的恐龙

16. In the future 在将来

17. be founded （被）成立

18. where else 别的什么地方

19. look up 查阅（单词……）

20. No smoking. 禁止吸烟。

21. No parking. 禁止停车

22. This side up 此面朝上

23. business hours 营业时间

24. No photos 禁止拍照

（二）常用的英语标识语。注意，标识语一般采用大写形式。CLOSED 打烊 PUSH 推 PULL拉

NO SMOKING 禁止吸烟 NO PARKING 禁止停车

NO PHOTOS禁止拍照 DANGER危险

PLAY 播放 STOP 停止 PAUSE 暂停

ON开 OFF关 BUSINESS HOURS营业时间

OFFICE HOURS 办公时间 FRAGILE易碎

THIS SIDE UP 此面朝上 ENTRANCE入口处

EXIT出口处 OPEN营业中

（三）日常交际用语

1．电话用语

This is… speaking 我是……

2．表示“有……”：

Are there any new inventions?

Is there any…?

3．其他

That’s very interesting. 那非常有趣。

Yes, many more. 是的，有许多。

When was the PLA founded? 中国人民解放军什么时候成立的？（被动语态）

It’s best to…

Thanks to…

What’s next?

The ground must be just right.

The hole should not be too deep.

教学建议

本单元重点例句及相关知识的讲解

1. I saw many old inventions on show.

我看到了许多古老的发明物在展览。

on show意思是“陈列，展览”。on表示“处于某种状态中”。show在此作名词用，与on构成短语，on + 名词还有

on duty（值日），

on sale（出售），

on business（出差），

on leave（休假）等。例如：

There are a number of model cars on show in the museum. And some of the old things are on sale now. She went to Beijing on business last week. Her assistant is on leave now. She could show you around next week.

在博物馆里有许多模型汽车展出，现在有些古老的东西正在出售。上周她到北京出差去了，她的助理也正在休假。她下周可以带你转转。

2. They were all invented hundreds of years ago.

它们都是几百年前发明的。

Hundreds of…意思是“数以百计的，成百上千的”。hundreds, thousand, million 等词与of一起用时，表示不定量的数目，必须用复数形式，而且前面不能有具体的数字。例如：

He has received thousands of letters. Hundreds of people are still waiting for him.

他收到了成千上万封信。数以百计的人还在等他。

当hundred, thousand等用来表示具体的数字时，要用原形，表示“一百/千……”时其

前常有基数词或“a”，后面直接跟所修饰的复数名词。例如：three hundred / thousand people / students

三百人/学生三千人/学生

five hundred goats / sheep

五百只山羊/ 绵羊

3. But I don’t know the way to the museum.

但是，我不知道去博物馆的路。

the way to…意思是“去……地方的路“，关于问路的常用句式有：

(1) Could you tell me how I can get to…?

Would you tell me which is the way to…?

Could you tell me how to get to…?

Will you please show me the may to…?

请你告诉我到……怎么走好吗？

(2) Could you tell me where the school is?

Where is the school, please?

请你告诉我学校在哪儿？

当然问路的表示法还有很多，在此不可能全归纳出来。

4. Have you ever seen dinosaurs on display in museum?

你在博物馆里看过恐龙展览吗？

on display意思为“陈列，展出”。这是一个介词短语，在句中可作表语和定语。同义词组是on show。如：

Some of her paintings are on display / on show in the local art galley.

她的一些画正在本地的美术馆展出。

The things on show / on display were all a hundred years ago.

展览的物品都有上百年的历史了。

5. There you can see the fossils of many kinds of dinosaurs.

在那里你能看到许多中恐龙的化石。

fossil意思为“化石”，是不可数名词；口语中还可指“守旧的人；落伍的人”。例如：My grandpa doesn’t want to be an old fossil.

我爷爷可不愿做个落伍的人。

6. These eggs were found in the Gobi Desert by a group of scientists in the 1920s.

这些蛋是一群科学家于二十世纪二十年代在戈壁大沙漠发现的。

in the 1920s意思为“在二十世纪二十年代”。年代的表达法：在年份前加the，年份后加s。如：in the 1840s在十九世纪四十年代

7. So these eggs were laid long long ago by dinosaurs.

这些恐龙蛋是很久以前恐龙孵化的。

句中laid是动词lay（产卵）的过去分词。

— How many eggs does your hen lay every week?

— Her hen is laying well，about three every week..

—你的母鸡每周产多少颗鸡蛋？

—我的鸡正常下蛋，大约每周三个蛋。

注意区别以下几个动词，它们的原形，过去式，过去分词及现在分词。现将这三个词的四种形态列表如下：

原形现在分词过去式过去分词

lay（摆放；产卵）laying laid laid

lie（躺） lying lay lain

lie（说谎） lying lied lied

(1) It’s ten o’clock now. Don’t lie in bed all morning.

都十点钟了，别一上午都躺在床上。

(2) She is an honest girl. She won’t lie to me. She has never lied to me.

她是个诚实的姑娘。她不会说谎的。她对我从来都没撒过谎。

8. That means dinosaurs lived long before human beings appeared!

那就是说恐龙在人类出现之前就存在了。

appear不及物动词，意为“出现”，反义词是：disappear意思为“消失”。它们的名词形式分别是appearance和disappearance。如：

When we reached the top of the hill, the town appeared below us.

当我们到达山顶时，市镇就呈现在我们脚下。

Dinosaurs disappeared about 65 million years ago. Scientists try to explain their disappearance.

恐龙大约在六千五百万年前就消失了。科学家试着解释它们消失的原因。

9. I say it is special because the dinosaur was covered with feathers!

我说它特别，是因为恐龙身上长有羽毛。

be covered with在句中意为“被……覆盖”，有时还用be covered by。例如：

The road was covered with yellow leaves. The fields were covered by flood. The

ground was covered with the white snow.

道路曾被黄叶盖住了。洪水曾淹没了田地。大地曾覆盖着白雪。

另外，cover… with…为主动形式，意思为“用……覆盖”。例如：

The beautiful girl often covers her face with her hands.

那美丽的姑娘经常用手捂着脸。

10. It was founded on October 1, 1949.

它是1949年报0月成立的。

found vt.创立，创办，它与find的过去式和过去分词相同，注意在句中的区别。found 的过去式和过去分词是在其后加-ed，即：

find（寻找） found found

found（成立，建立） founded founded

例如：

Mr. Wang is going to found a new factory near our factory. He was very busy this morning. His lost coat was found under the bed at last.

王先生准备在我们工厂附近创办一家新工厂。今天早上他很忙，他丢失的上衣终于在床下找到了。

11. It’s interesting, isn’t it?

它有趣，是吗？

interesting和interested都来源于名词interest，interesting可作表语和定语，主语常指物；interested作表语，主语常指人，常构成be (become) interested in…对……感兴趣。类似的词还有surprising和surprised。

surprising和surprised都是由surprise变换而来的，前者有主动含义，后者有被动含义，surprising的主语通常是物，而surprised的主语通常是人。Be surprised at + n. (v. + ing) 对……感到惊讶，be surprised后还可接不定式和that引导的从句。例如：

(1) The news from the girl is very surprising. She said that dull film was interesting.

从那个女孩那儿得来的消息非常令人吃惊。她说那个无聊的电影很有趣。

(2) The students were very interested in dinosaurs when they visited the museum. They were surprised at seeing the teacher in front of them. Do you know why they surprised to meet their teacher in the museum?

学生们在参观博物馆时对恐龙很感兴趣。他们很惊讶地看见老师就在他们前面。你知道在参观博物馆时，为什么他们对遇见老师感到很惊讶吗？

12. When the bowl was filled with hot water, the wine would get warm.

当碗里装满了热水，酒就会变热。

Be filled with （某物）被装满……，

其主动式为fill… with…把……装满……。例如：

When the room was filled with the smoke, we were filling the hole. The hole was filled with sand at last.

房间里弥漫着烟雾时，我们正用填洞。最终这个洞被沙填上了。

另外，类似的短语录还有be full of：意思是“充满……”表示状态。

The bottle is full of milk.

这个瓶装满了牛奶。

The garden is full of sheep.

园子里到处是羊。

13. Have you used / worn it a lot?

你经常用 / 穿吗？

这里的a lot相当于often，表示经常，在句中做状语录。另外，a lot常单独使用，成为句子的一个成分，在句中可作主语、宾语或状语，意思是“很多，非常”。例如：

(1) Thanks a lot (=very much)!（作状语）

多谢！

(2) We can learn a lot (=much) from the workers. （作宾语）我们能从工人们那里学到很多东西。

(3) A lot (=much) has been done about the thing. （作主语）关于这件事已经采取了许多措施。

(4) It is a lot (=much) colder today.

（作状语）今天冷多了。

XX文讯教育机构

WenXun Educational Institution

初中英语 Unit 1 When were you born

Unit 1 When were you born? 1.swimmer(swim, swam ,swum swimming)游泳者，游泳运动员 Ye Shiwen is a well-known s_________. 2.born( bear, bore, born) be born出生，出世 He was b_______in 1999./ He was b_____ in May 1999./ He was b____ on May Day, 1999. 3.ice (icy) 冰 He stood in the box of i______ for two days ,fifteen hours and forty-two minutes. 4.tower 塔 He stood on the t______ for one day and eleven hours. 5.admire 欣赏，仰慕guy 家伙，男人，小伙子 I a_________ that g________with great talent. 6.paint (painting) 用颜料画 He p________ pictures on the ground or on buildings. When did he started p____these pictures? 7.flat 水平的，平坦的 The pictures are f_________, but they look like they are 3D. 8.get in trouble 遇到麻烦 He sometimes got in t________for p_______the buildings at school. 9.Nobel Prize 诺贝尔奖literature 文学 Chinese writer Mo Yan has won the 2012 N______ P_______in L_______! Mo Yan won the N______ P_____ in L_____ in 2012. 10.as 因为，由于 Mo said he never expected to win the prize , a___ there were so many good writers all over the world. 11.drop out of school 辍学 When he was 12 (At the age of 12/, he d_______ o____ o___ school and started to work, first in his village and later in a factory. 12.means 方式，方法，途径try every means to do辍学 He had to try every m_______to find books to read. 13.at hand（时间或空间上）接近的，不远的 With no books at h_______, he started reading a Chinese dictionary. 14.publish 出版 His first short story was p______ in 1981. 15.novel 小说sorghum高粱director导演 He became famous in 1987 when his n______ Red S______was made into a film by the famous d______ Zhang Yimou. 16.frog 蛙 He also won the 18th Mao Dun Literature Prize in 2011 for his novel f_______. 17.works 作品，著作 More and more people are becoming interested in his w_______. 18.besides (except)除----之外 What other prize in literature did Mo Y an win b_______ the Nobel Prize. 19.perform(performance, performer) 表演，演出opera 戏剧 Mei Lanfang first f_______Beijing O________at the age of ten. 20.Brazilian 巴西的，巴西人national(nation, international,) 国家的，民族的 Ronaldo , the great B_________soccer player , played for his first n________team when he was 17 years old.

人教版初中九年级英语Unit8_SectionB(3a-Self_Check)优质课教案_2

人教版初中九年级英语Unit8 SectionB（3a-Self Check）优质课教案Aims of knowledge and ability : 1. Have a general idea about basic writing. 2. How to write a narration. 3. Put useful information together logically. Aims of emotion: Get the students to be confident to write a basic writing. Learn to work in groups. Teaching strategy: motivations, information processing , cooperative learning Key points: Master the ways to write a basic writing, write a narration Difficult points: search the phases, how to write the composition logically Teaching procedures: Step1：Greetings Introduce myself and my hometown . Step 2: Lead-in I’ll tell the Ss that I am busy and tired, ask them if they have the same feeling,(maybe some say yes)so how could you adjust yourself ? Step 3: presentation : task 你现在是一名中学生，最近学习紧张繁重，你觉得身心疲惫。你认为你和你的同学们应该怎样调节呢？请根据下面的信息提示写一篇短文。开头结尾已经给出。信息提示：1.平衡饮食… 2.参加运动…3.充足睡眠… 要求: 根据信息要求，把握重点,适当发挥,不逐字翻译。词数在80词左右。 I am a middle school student now. Many of my classmates feel tired and nervous these days. Here I have some advice. …… Step 4: Brainstorming Figure out the key words and phrases by working in groups Step 5: Check their answers and offer a form of some key words and phrases they may use in their sentences.

初中英语过去进行时(when-while用法)

Summary 3 Past Co nti nuous Tense 过去进行时总结 I. Defin itio n 时态含义表示过去某一时刻或过去一段时间内正在进行的动作。 II. Time words 时间标志词 1. then, at that time, this time yesterday, at 6 o ' clock yesterday ... 2. when/ while/ (just) as 引导的时间状语从句 III. Structure 动词结构 was/ were + doing ? Whe n/ while/ (just) as 引导的时间状语从句在过去进行时态中的用法区别 1. when既可以和短暂性动词连用，也可以和连续性动词连用, 句中一般翻译为“当...... 时候” / “就在那时”。 a. Some one kno cked at the door whenI was hav ing breakfast. b. I was tak ing a bath whenthe teleph one rang. 2. while只可以和连续性动词连用句中一般翻译成“当...... 时候”(=wheri) / “然而”(强调前后两个动作同时进行) a. He cut himself while he was shaving. b. My wife was cooking the dinner while I was working in the garden. 3. (just) as 更强调“随着”，所引导的从句动作一般与主句动作伴随着发生。 a. Just as I was ope ning the front door, the teleph one rang. b. The children were singing as they went home.

WHEN与WHILE用法区别

WHEN与WHILE用法区别 when, while这三个词都有"当……时候"之意，但用法有所不同，使用时要特别注意。 ①when意为"在……时刻或时期"，它可兼指"时间点"与"时间段"，所引导的从句的动词既可以是终止性动词，也可是持续性动词。如： When I got home, he was having supper.我到家时，他正在吃饭。 When I was young, I liked dancing.我年轻时喜欢跳舞。 ②while只指"时间段"，不指"时间点"，从句的动词只限于持续性动词。如：While I slept, a thief broke in.在我睡觉时,盗贼闯了进来。辨析 ①when从句与主句动作先后发生时，不能与while互换。如： When he has finished his work, he takes a short rest.每当他做完工作后，总要稍稍休息一下。(when = after) When I got to the cinema, the film had already begun.当我到电影院时，电影已经开始了。(when=before) ②when从句动词为终止性动词时，不能由while替换。如： When he came yesterday, we were playing basketball.昨天他来时，我们正在打篮球。 ③当从句的谓语是表动作的延续性动词时，when, while才有可能互相替代。如：While / When we were still laughing, the teacher came in.正当我们仍在大声嬉笑时，老师进来了。 ④当从句的谓语动词是终止性动词，而且主句的谓语动词也是终止性动词时,when可和as通用，而且用as比用when在时间上更为紧凑，有"正当这时"的含义。如： He came just as (or when) I reached the door.我刚到门那儿，他就来了。 ⑤从句的谓语动词如表示状态时，通常用while。如： We must strike while the iron is hot.我们应该趁热打铁。 ⑥while和when都可以用作并列连词。

新目标(Go-for-it)版初中英语九年级(全一册)期末测试题

九年级期末学业水平测试英语试题本测评卷分第Ⅰ卷（选择题）和第Ⅱ卷（非选择题）两部分，第Ⅱ卷即答题卷。满分120分。考试时间120分钟。第Ⅰ卷（选择题共85分）一、听力部分（20分）（一）听句子选答语。（5分）根据你所听到的句子，选择正确的答语。每个句子读两遍。1．A．By bike．B．By reading a lot．C．By the river. 2．A．No, I don’t．B．Yes, I am．．C．Yes, I did. 3．A．They don’t agree．B．No, I don’t C．I agree. 4．A．It must be Tom．B．It could belong to Tom． C．It might be OK. 5．A．I’d get a pen for him． B．I’m going shopping． C．I’ve got a book.. （二）对话理解。（5分）根据你所听到的对话内容，选择最佳选项。每段对话读两遍。6．A．Swimming B．Dreaming．C．Driving. 7．A．Pop music．B．Classical music．C．Country music. 8．A．Mary’s B．Carl’s．C．Fred’s. 9．A．To give her sister as a present． B．To give them to her mother． C．To get her ears pierced. 10．A．She would go back to school． B．She would take a vocation． C．She would find another job. （三）短文理解。（10分）根据你所听到的短文内容，选择最佳选项。短文读两遍。11．Carol is ______ this year． A．12．B．13．C．14 12．Carol is good at English because ________. A．she has read many English books

When和while在初中英语学习中的要点归纳

When和while在初中英语学习中的要点归纳when 既可用作副词，又可用作连词，也可用作代词。由于when 的用法是既是学生学习的重点难点，又是中考考试考查的热点之一。下面就when 的用法作如下归纳：一、用作疑问副词，意思为“什么时候、何时”，引导特殊疑问句或后跟动词不定式。例如： When will you come to see me? 你什么时候要来看我？ When are they going to visit the Great Wall? 他们打算什么时候去游览长城？ I don't know when to leave for London. 我不知道该在何时动身去伦敦。二、when 用作连词，意为“当……的时候”，引导时间状语从句。 When 在引导时间状语从句时，主从复合句的时态相互制约，要保持主从复合句时态的大体一致。也就是说，要么都是现在时态，要么就是过去时态。现在时态包括：一般现在是、一般将来时、现在进行时以及现在完成时；过去时态包括：一般过去时、过去进行时、过去将来时和过去完成时。when在构成时间状语从句时，主要有以下特点： 1.when后面所跟的句子不可能运用现在进行时、过去进行时、现在完成时、过去完成时、一般将来时以及过去将来时。 2.主句+ when +从句，时态制约如下：（1）主句用一般将来时，从句用一般现在时，如： Jim will ring you up when he comes back. 当吉姆回来的时候，他将给你打电话。（2）主句用情态动词原形，从句用一般现在时，如： She can help me with my English when she has time. 当她有空的时候，他能帮助我学习英语。（3）主句是祈使句，从句用一般现在时，如： Please leave here when I begin working.当我开始工作的时候，请离开这儿。（4）主句用一般过去时，从句用一般过去时，如： They learned a lot from the peasants when they stayed in the village. 他们住在那个村子时，从农民那里学到了许多东西。（5）主句用过去进行时，从句用一般过去时，如： It was snowing when he arrived at the station. 他到达车站时，天正下着雪。

when 和while的用法区别

when 和while的用法区别 ①when是at or during the time that, 既指时间点，也可指一段时间； while是during the time that，只指一段时间，因此when引导的时间状语从句中的动词可以是终止性动词，也可以是延续性动词，而while从句中的动词必须是延续性动词。 ②when 说明从句的动作和主句的动作可以是同时，也可以是先后发生；while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。 ③由when引导的时间状语从句，主句用过去进行时，从句应用一般过去时；如果从句和主句的动作同时发生，两句都用过去进行时的时候，多用while引导，如： a. When the teacher came in, we were talking. 当此句改变主从句的位置时，则为： While we were talking, the teacher came in. b. They were singing while we were dancing. ④when和while 还可作并列连词。when表示“在那时”；while表示“而，却”，表对照关系。如： a. The children were running to move the bag of rice when they heard the sound of a motor bike. 孩子们正要跑过去搬开那袋米，这时他们听到了摩托车的声音。 b. He is strong while his brother is weak. 他长得很结实，而他弟弟却很瘦弱。 when，while，as引导时间状语从句的区别 when，while，as显然都可以引导时间状语从句，但用法区别非常大。一、when可以和延续性动词连用，也可以和短暂性动词连用；而while和as只能和延续性动词连用。 ①Why do you want a new job when youve got such a good one already？（get 为短暂性动词）你已经找到如此好的工作，为何还想再找新的？ ②Sorry，I was out when you called me．（call为短暂性动词）对不起，你打电话时我刚好外出了。 ③Strike while the iron is hot．（is为延续性动词，表示一种持续的状态）趁热打铁。 ④The students took notes as they listened．（listen为延续性动词）学生们边听课边做笔记。二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while和as从句的谓语动作必须是和主句谓语动作同时发生。 1．从句动作在主句动作前发生，只用when。 ①When he had finished his homework，he took a short rest．（finished先发生）当他完成作业后，他休息了一会儿。 ②When I got to the airport，the guests had left．（got to后发生）当我赶到飞机场时，客人们已经离开了。 2．从句动作和主句动作同时发生，且从句动作为延续性动词时，when，while，as都可使用。

【范文】九年级英语It's important to have good habits 知识

九年级英语It's important to have good habits 知识点整理九年级英语It'simportanttohavegoodhabits知识点整理 1.helpout帮助某人解决困难 2.talkwithsb.;talkoversth.;talkabout 3.It‟simportanttotalkproblemsoverwithsomeone.与人讨论问题是重要的。句型：Itisadj+todosth对某人来说是…的 2.要想更好的了解世界，我们有必要学好英语。 Itisnecessary________us_________________Englishwell toknowmoreabouttheworld. 3.他们知道改变坏习惯永远不会太晚。 Theyknowitisnever_____late_______changebadhabits. 4.makeone‟sowndecision做自己的决定 5.chatontheinternet在网上聊天 6.payattentionto注意 7.Inordertobehealthy,teenagersneedtogetenoughsleep.

inordertodo为了做某事。语境感悟：Tomtriedhisbesttoexerciseinordernottoincreaseweight. Thenewcompanygaveawaylotsofadsinorderthatpeoplecang ettoknowit. 跟踪练习：jimisstudyingharder________getintoabetteruniversity. A.Inorderthat B.inordertoc.sothatD.assoonas 8.Getthroughtheirteenageyearswiththehelpoftheirfami liesandfriends. Getthrough通过;到达;做完;度过;接通电话;让…了解 Itishardtoseehowpeoplewillgetthroughthewinter.难以想象人们将怎样熬过这个冬天。 Thewindowwasfartoosmallforhimtogetthrough.窗户对他来说实在太小，他钻不过去。 I'vebeentryingtoringupalldayandIcouldn'tgetthrough.我整天都在拨电话，但总是接不通 9.stayoutlate在外面待到很晚 Theteachertoldthestudenttopayattentiontohisspelling.

whendoing的用法.doc

When + doing"的用法 Every teacher should, therefore, follow in his footsteps and emphasize benevolence when teaching. 因此，每个老师教学时，应效法孔子并强调仁的道理。 = Every teacher should,therefore,follow in his footsteps and emphasize benevolence when he teaches . 在以when,while,if, once ,though,unless 等六个连词引导的状语从句中，若主语与主句的主语相同时，可将从句中的主语删除，并将之后的动词变成现在分词。若是be动词，一律变成分词being,而being再予以省略。 1. when you do the work, you should be careful. = When doing the work, you should be careful. 2. If I am free, I'll do it. = If free, I'll do it. 3. when you do the work, you must be careful. = When doing the work, you must be careful. 4. Though he is poor, he is happy. = Though poor, he is happy. 5. While I was watching Tv, I fell asleep. = While watching TV. I fell asleep. 6. When you drive a car, you should be alert. = When driving a car, you should be alert.

英语人教版八年级下册when 和while 的用法

when和while when和while都可表示“当……的时候”，引导时间状语从句。你知道两者在过去进行时中的用法有什么不同吗？请仔细观察下面的例句，然后补全空格中的内容。 ①I was walking to school when I saw a cat in a tree. ②When Sally arrived home, her mother was cleaning the house. 主句的动作是持续性的，而从句动作是短暂性的，此时用_______引导时间状语从句，主句用_____________时态，从句用一般过去时态。 ③While I was sleeping in the bedroom, someone knocked at the door. ④David fell while he was riding his bike. 主句的动作是短暂性的，从句的动作是持续性的，此时用_________引导从句，主句用____________时态，从句用过去进行时态。 ⑤While Andy was waiting for the bus, he was reading a newspaper. ⑥He was cleaning his car while I was cooking. 主句和从句的动作在过去的某时刻或某段时间同时发生，而且动作都是持续性的，此时用_________引导从句，而且主句和从句都用_____________ 时态。练习：用when 和while 填空 1. We were singing __________ the teacher came in. 2. _________ I was doing my homework , my mother was cooking. 3. What were you doing _________ the rainstorm came ? 4. ________ I was waiting for the bus at the bus station, it began to rain. 5. ________ he woke up, the smoke was rising.

when 引导的从句用法一

when 引导的从句用法一、引导时间状语从句 1. 表示"当……的时候",相当于at the moment when。例如: When we got to the cinema, the film had been on for half an hour. 当我们到达电影院时,电影已放映半小时了。She was writing a letter when I came in. 当我进来时,她在写信。 2. 表示"一……就……",相当于as soon as。例如: The students got up when the bell rang. 铃声一响,学生们就起床了。I'll ring you up when I arrive in Beijing. 我一到北京就给你打电话。 3. 表示"就在这时;当时",相当于just at the moment或just then .例如: We were about to start out when it began to rain heavily. 我们正要启程,就在这时,天下起了大雨。 He had just returned from one business trip when he was asked to make another one. 他刚刚出差回来,这时,又叫他再次出差。 4. 表示"每当;每次",相当于every time或whenever。例如: She always turns to us for help when she is in trouble.每当她遇到困难,她总是向我们求助。It is freezing cold here when it snows. 每当这儿下雪,天气就十分寒冷。 5. 表示"当……之后;在……以后",相当于after the time that。例如: We went home when the film was over. 电影结束以后,我们回家去了。When she got home, she started to prepare supper. 她回到家后,开始准备晚饭。二、引导条件状语从句 when引导的条件状语从句相当于if/ in case引导的条件状语从句.例如: When there is no gravity, our feet can no longer stay on the ground. 如果没有重力,我们的脚就不能够在地面上站稳。Turn off the switch when anything goes wrong with the machine. 如果机器发生故障,就把电闸关上。三、引导原因状语从句when引导原因状语从句时,相当于since/now that引导的原因状语从句。例如: How can they learn anything when they spend all their spare time watching television? 他们把所有的空闲时间都用来看电视了,还能学到什么东西呢? Why do you want a new job when you have got such a good one? 既然你已经有了这么好的一份工作,为什么还要再找新的工作呢? 四、引导让步状语从句when引导的让步状语从句相当于though或although引导的让步状语从句。例如: He usually walks when he might ride. 虽然有车可乘,但他通常是步行。 The little girl can tell right from wrong when she is only twelve. 这个小女孩虽然只有十二岁,却能分清是非。五、引导定语从句when引导定语从句时,有时可用in which或on which来替代。例如:We'll put off the picnic until next week, when the weather may be better. 我们要把野餐推迟到下周,那时可能天气好些。 I'll never forget the day when I joined the Party. 我将永远不会忘记我入党的那一天。六、引导名词性从句 1. 引导宾语从句。例如: Please tell us when his father will return from abroad. 请告诉我们他父亲什么时候从国外回来。 2. 引导主语从句。例如: When they will leave for Australia hasn't been decided. 他们什么时候动身去澳大利亚还没有决定。 3. 引导表语从句。例如: The question is when they will get so much money to set up the factory. 问题是他们将在什么时候弄到这么多钱来把这个工厂办起来。 when, while 和as 引导时间状语从句的用法这三个词的意思很简单，都有“当……时候”的意思。但学生经常会问三个词的区别在哪儿，特别是在做选择题的时候。别说是学生，就我个人而言，做这样的选择题要保证百分之百的正确也是不可能的。现根据大量的实例和个人的思考，做一点小结，供大家参考。一、when 的用法如果只从现象来看，when 从句用的最多的是一般过去时，而主句的时态没有限制,根据具体情况而定1. When he was a child he was always trying out new ideas. 他小时候就常常试验一些新的设想。 2. When she came into my room, I was just reading a book. 她走进我房间时，我正在看书。 3. Were you writing when the teacher came in? 老师进来的时候，你在写信吗？ 4. Sorry, I was out when you called me. 对不起，你打电话来的时候我出去了。 5. He was on the point of leaving when someone knocked at the door. 他正要走，这时有人敲门。 6. I thought of it just when you opened your mouth. 就在你要说话的时候，我也想到了。

When的用法小结

When的用法小结一、作为副词,它有以下的用法: 1. 作为疑问副词,引导特殊疑问句,意为“什么时候;何时”。如: ( 1 ) When will they come back? ( 2 ) What time will they come back? 回答when 引导的从句,不一定指出具体的时间点。如回答句( 1 )可用tomorrow, next month 等。而回答what time 引导的问句,则必须说出具全的时间点,如at two o'clock, at five past ten 等。 2. 作连接副词,引导名词性从句或不定式,意为“什么时候”。从句使用陈述句语序,时态根据实际情况而定。如: ( 1 ) I'd like to know when they will come. 我想知道他们什么时候来。( when 引导宾语从句) ( 2 ) Can you tell me when the bank opens? 你能告诉我银行什么时候开门吗?( when 引导宾语从句) ( 3 ) When she'll be back depends much on the weather. 她何时回来在很大程度上取决于天气。( when 引导主语从句) ( 4 ) Have you decided when to go sightseeing? 你们已经决定什么时候去郊游了吗?( when 引导不定式结构) 3. 作疑问代词,常和介词since, till, up to 等连用,意为“什么时候”。如: ( 1 ) Since when have they had the house? 他们从什么时候起有这幢房子的? ( 2 ) Till when is the library open? 图书馆开放到几点呢? 4. 作关系副词,引导限制性定语从句和非限制性定语从句。

when的用法小结

when 用法小结不管是在口语中，还是在书面语中，when是一个十分活跃的词，该词主要用作连词和副词，但是在意义方面其用法比较复杂。一、作副词 1. 作疑问副词，用于构成特殊疑问句，意为“什么时候；何时”。 When will they come back？他们什么时间回来？ When can you finish the work? 你什么时间能完成这项工作？ 2. 作连接副词，引导名词性从句，或与不定式连用，意为“什么时候”。 Can you tell me when the bank opens？你能告诉我银行什么时候开门吗？ When she'll be back depends on the weather. 她何时回来取决于天气。 Have you decided when to go sightseeing？你们已经决定什么时候去郊游了吗？ 3. 作关系副词，引导定语从句。 The main school holidays are from mid-December till early February，when the days are long and warm. 学校的主要假期是从12 月中旬到2 月初，这段时间里白天长而且很温暖。 Do you remember the time when the three of us went on a holiday in Guilin？你还记得我们三个人在桂林度假的那段时光吗？二、作从属连词，引导状语从句。 1. 表示时间，意为“当……时；在……的时候”。 When you see him, please say hello to him. 见到他时，代我问他好。 When I reached the station，the train had left. 当我到达火车站时，火车已经开走了。 2. 表示条件，相当于if。 How can I get a job when I can't even read or write？