when-的用法

when 的用法

一、when 用作副词。

1. 用作疑问副词，引导特殊疑问句。(什么时候，何时 [at what time ])例如：

①When will you come to see me?

②When are they going to visit the Great Wall?

2. 用作连接副词，通常用来引导名词性从句[主语从句、表语从句、同位语从句、宾语从句]及起名词作用的“when ＋动词不定式”结构。(什么时候，何时 [at which; on which ])例如：

①When he comes is not known. [主语从句]

②The morning is when I am busiest. [表语从句]

④I don't know when the plane takes off. [宾语从句]

⑤I don't know when to leave for London. [宾语]

3. 用作关系副词，引导限定性定语从句和非限定性定语从句。(在…的时候 [at/on/in/during which])例如：

①Do you still remember the days when we stayed in America?

②The day will come soon when the Chinese astronauts will go to the moon.

③It happened ten years ago, when I was a child.

④We will go to the countryside at the beginning of June, when the summer harvest will start.

二 . when 用作连词。

1. 用作从属连词，意为“当……的时候[at the time when ]”，引导时间状语从句。例如：

①They learned a lot from the peasants when they stayed in the village.

②It was snowing when he arrived at the station.

【点津】如果 when 引导的从句中的主语和主句中的主语一致，且从句中的谓语动词是“be ＋分词”或从句主语是 it ，则 be 动词及其主语常可省略。例如：

③When（ he was ）asked why he was late, he made no answer.

④I'll tell him about it when（ it is ）possible.

2. 用作从属连词，意为“一……就……”，引导时间状语从句。[immediately after]例如：

①We will stand up when the teacher comes into the classroom. 老师一进教室我们就起立。

②Fire the rockets when I give the signal.

3. 用作从属连词，意为“还没 / 刚刚/刚一……就”，引导时间状语从句。[immediately after]例如：

①I had hardly opened the door when he came in. 我刚一开门，他就进来了。

②I had not been reading for half an hour when I heard someone call my name.

【点津】hardly…when和no sooner…than的结构要注意三点：意思为“一A就B“；A句通常用完成时态；hardly 和 no sooner 位于句首时要注意部分倒装。

4. 用作从属连词，意为“倘若，如果”，表示条件。例如：

①Turn off the switch when anything goes wrong with the machine. 如果机器发生故障，就把电源关上。

②He will be likely to recover when he is operated on.

5. 用作从属连词，意为“既然，尽管”，表示让步。例如：

①Why use metal when you can use plastic?既然能用塑料,为什么用金属?

②They kept trying when they knew it was hopeless. 尽管他们知道那件事没有希望，可是他们还在不断地努力。6. 用作并列连词，意为“在那时，届时;就在这时”，表示时间。这时主句中可以用过去进行时，过去完成时或“ was/were about to do sth. ”结构。

①Last night I was about to go to bed when the phone rang.

②I was cooking in the kitchen when someone knocked at the door.

③He had just finished the book when supper was served.

7. 用作并列连词，意为“虽然、然而、可是”，表示转折。例如：

①He usually walks to work when he might take a bus. 虽然他可

以坐公共汽车上班，但他却常常步行上班。

②I had only twenty dollars when I needed thirty to buy the dictionary.我需要 30 美元买那本字典，可是我只有20美元。

8. 用作并列连词，意为“而、却”，表示对比。例如：

How can he say that everything is fine when it's obvious that it is not? 他怎能说一切都好呢？情况显然不是那样。

三 . when 用作代词[which time]。

when 作为代词常常位于介词之后，意为“那时，什么时候”。例如：

①Since when have you been studying Japanese?

【点津】since when 作引导词时是“介词（since）+关系代词（when）”的结构，when意为which time。since when常引导非限制性定语从句，从句应用完成时态。

②I came here in 1949, since when I have been engaged in this work. 我1949年到这里，从那时起我就担任这项工作。

③We came back on Tuesday, since when we have been working in the repair shop.

④We came a week ago, since when the weather has been bad. 四、when 还可用作名词，前面常常用定冠词 the。 the when 表示事

件发生的时间,常常与 the where, the how 并列使用。

He told the police the when and the how of the accident. 他告

诉警察事故发生的时间及发生的原委。

［巩固练习］

1. I remember ______ this used to be a quiet village.

A. when

B. how

C. where

D. what

2. Why do you want a new job _____ you've got such a good one already?

A. that

B. where

C. which

D. when

3. It was an exciting moment for these football fans this year, ______ for the first time in years their team won the World Cup.

A. that

B. while

C. which

D. when

4. We are living in an age _______ many things are done on computer.

A. which

B. that

C. where

D. when

5. The reporter said that the UFO ______ east to west when he saw it.

A. was travelling

B. travelled

C. had been travelling

D. was to travel

6. ______ got into the room _________ the telephone rang.

A. He hardly had; then

B. Hardly had he; when

C. He had not; than

D. Not had he; when

7. ---- Can I join your club, Dad?

---- You can when you _______ a bit older.

A. get

B. will got

C. are getting

D. will have got

8. I shall never forget those days ________ I lived in the countryside with the farmers, ________ had a great effect on my life.

A. that; which

B. when; which

C. which; that

D. when; who

9. The film brought the hours back to me ______ I was taken good care of in that faraway village.

A. until

B. that

C. when

D. where

10. He was about to tell me the secret ______ someone patted him on the shoulder.

A. as

B. until

C. while

D. when

11. My brother left school in 2005 ,and since then he ______in Beijing .

A. lives

B. lived

C. will live

D. has lived

12. Tom left Shanghai for London on May 5 , since___I have never called him up.

A when

B then C. while D. that

Key

1. ADDDA 6. BABCD 11. DA

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when的用法总结大全

when的用法总结大全 when的用法你知道多少，今天给大家带来when的用法，希望能够帮助到大家，下面就和大家分享，来欣赏一下吧。 when的用法总结大全 when的意思 adv. 什么时候,(用于时间的表达方式之后)在那时,其时,当时conj. 在…时,既然,如果 pron. 什么时候,那时 n. 时间，时候,日期,场合 when用法 when可以用作副词 when的基本意思是“什么时候”。可用作疑问副词,用来询问某事曾发生或将要发生的时间,引导特殊疑问句; 还可用作关系副词引导限制性定语从句、非限制性定语从句和表语从句,表示“是…时候的事”。 when可用作从属连词,引导状语从句,表示时间时作“当…时,在…的时候”解; 表示条件时作“如果,要是”解; 表示对比时作“既

然,考虑到”解。当when所引导的从句的主语和主句的主语一致时,常将其主语、系动词或助动词省去,只留实义动词或表语,或者改写为短语。 when所引导的时间状语从句用一般现在时代替将来时,用现在完成时代替将来完成时。 when用作副词的用法例句 When did that happen?那件事是什么时候发生的? They stood respectfully when he entered the room.当他走进房间时，他们都恭恭敬敬地站着。 Iron will melt when it is made very hot.当铁烧得很热时就会熔化的。 when可以用作连词 when可用作从属连词,引导状语从句,表示时间时作“当…时,在…的时候”解; 表示条件时作“如果,要是”解; 表示对比时作“既然,考虑到”解。当when所引导的从句的主语和主句的主语一致时,常将其主语、系动词或助动词省去,只留实义动词或表语,或者改写为短语。 when所引导的时间状语从句用一般现在时代替将来时,用现在完成时代替将来完成时。

从一道高考题看when的运用

从一道高考题看when的运用 when是中学英语中一个非常活跃的词，其意义丰富，用法灵活，不易被大家掌握。高考试题经常涉及对when的考查。请看2004年北京春季高考单项填空第26题： We were swimming in the lake ______ suddenly the storm started. A. when B. while C. until D. before 此题考查的就是when的用法，从语境可知，该空表示“正在这时”，答案选A。 下面结合高考试题对when的 用法作一归纳，希望对同学们有所帮助。 一、when可以用作从属连词，引导时间状语从句，意为“当……的时候”，从句的谓语动词可以是延续性的（此时相当于while）,也可以是非延续性的。其引导的时间状语从句通常用现在时表示将来 [真题再现] 1. —He was nearly drowned once. —When was ____? —______ was in 1998 when he was in middle school.(2002北京春招) A. that; It B. this; This C. this; It D. that; This 2. The reporter said that the UFO_______ east to west when he saw it.(NMET2000) A. was traveling B. traveled C. had been traveling D. was to travel 3. —Can I join your club, Dad? —You can when you _____ a bit older.(NMET1994)

主将从现专项练习

一、请用正确的形式填空。 1. If I come, I ________ ( see ) you. 2. If it is fine, we______( go ) for a walk. 3. If it rained, they _________ ( stay ) at home. 4. You will spoil it if you ______ ( not be ) careful. 5. We would be very much pleased if you _____( come ). 6. Will you help me if I _____ ( need ) you. 7. They will get wet if it _____ ( rain ). 8. What a pity I haven’t got my car. If I had, I _________( take ) you to the airport. 9. We would answer if we _____( can ). 10. If you eat too much, you ______( get ) ill. 二、选择正确的答案。 ()1.If you want to learn English well,you must use it as___as possible. A.often B.long C.many D.soon ()2.---What will Bill do if he____in the test? ---He will try again. A.fail B.fails C.will fail D.is failing ()3.Please tell her the news when she_____.OK,I will. https://www.sodocs.net/doc/1c6324998.html,es B.will come. https://www.sodocs.net/doc/1c6324998.html,e D.would come ()4.The students will plant trees if it___tomorrow. A.didn’t rain B.hasn’t rained C.won’t rain D.doesn’t rain ()5.We__home if there is no bus.---Oh,what a pity! A.will walk B.have walked C.walked D.walk ()6.If it_____tomorrow,I’ll go by car. A.rain B.will rain C.rains D.would rain ()7.If Mary_______next Sunday,we will go boating together. A.will come https://www.sodocs.net/doc/1c6324998.html,es C.shall come D.should come ()8.---Don’t forget to ask him to write to me. ---I won’t.As soon as he_______,I’ll ask him to write to you. A.will come B.came https://www.sodocs.net/doc/1c6324998.html,es D.is coming ()9._____the young girl_____the old man clean his room every day? -Yes,she does. A.Does;help B.Has;helped C.Did;help D.Do;helps ()10.Our geography teacher told us yesterday that the earth___aro und the sun.

when-的用法

when 的用法 一、when 用作副词。 1. 用作疑问副词，引导特殊疑问句。(什么时候，何时 [at what time ])例如： ①When will you come to see me? ②When are they going to visit the Great Wall? 2. 用作连接副词，通常用来引导名词性从句[主语从句、表语从句、同位语从句、宾语从句]及起名词作用的“when ＋动词不定式”结构。(什么时候，何时 [at which; on which ])例如： ①When he comes is not known. [主语从句] ②The morning is when I am busiest. [表语从句] ④I don't know when the plane takes off. [宾语从句] ⑤I don't know when to leave for London. [宾语] 3. 用作关系副词，引导限定性定语从句和非限定性定语从句。(在…的时候 [at/on/in/during which])例如： ①Do you still remember the days when we stayed in America? ②The day will come soon when the Chinese astronauts will go to the moon. ③It happened ten years ago, when I was a child. ④We will go to the countryside at the beginning of June, when the summer harvest will start. 二 . when 用作连词。 1. 用作从属连词，意为“当……的时候[at the time when ]”，引导时间状语从句。例如： ①They learned a lot from the peasants when they stayed in the village. ②It was snowing when he arrived at the station. 【点津】如果 when 引导的从句中的主语和主句中的主语一致，且从句中的谓语动词是“be ＋分词”或从句主语是 it ，则 be 动词及其主语常可省略。例如： ③When（ he was ）asked why he was late, he made no answer. ④I'll tell him about it when（ it is ）possible. 2. 用作从属连词，意为“一……就……”，引导时间状语从句。[immediately after]例如： ①We will stand up when the teacher comes into the classroom. 老师一进教室我们就起立。 ②Fire the rockets when I give the signal. 3. 用作从属连词，意为“还没 / 刚刚/刚一……就”，引导时间状语从句。[immediately after]例如： ①I had hardly opened the door when he came in. 我刚一开门，他就进来了。 ②I had not been reading for half an hour when I heard someone call my name. 【点津】hardly…when和no sooner…than的结构要注意三点：意思为“一A就B“；A句通常用完成时态；hardly 和 no sooner 位于句首时要注意部分倒装。 4. 用作从属连词，意为“倘若，如果”，表示条件。例如： ①Turn off the switch when anything goes wrong with the machine. 如果机器发生故障，就把电源关上。 ②He will be likely to recover when he is operated on. 5. 用作从属连词，意为“既然，尽管”，表示让步。例如： ①Why use metal when you can use plastic?既然能用塑料,为什么用金属? ②They kept trying when they knew it was hopeless. 尽管他们知道那件事没有希望，可是他们还在不断地努力。6. 用作并列连词，意为“在那时，届时;就在这时”，表示时间。这时主句中可以用过去进行时，过去完成时或“ was/were about to do sth. ”结构。 ①Last night I was about to go to bed when the phone rang. ②I was cooking in the kitchen when someone knocked at the door. ③He had just finished the book when supper was served. 7. 用作并列连词，意为“虽然、然而、可是”，表示转折。例如： ①He usually walks to work when he might take a bus. 虽然他可 以坐公共汽车上班，但他却常常步行上班。 ②I had only twenty dollars when I needed thirty to buy the dictionary.我需要 30 美元买那本字典，可是我只有20美元。 8. 用作并列连词，意为“而、却”，表示对比。例如： How can he say that everything is fine when it's obvious that it is not? 他怎能说一切都好呢？情况显然不是那样。 三 . when 用作代词[which time]。 when 作为代词常常位于介词之后，意为“那时，什么时候”。例如： ①Since when have you been studying Japanese? 【点津】since when 作引导词时是“介词（since）+关系代词（when）”的结构，when意为which time。since when常引导非限制性定语从句，从句应用完成时态。 ②I came here in 1949, since when I have been engaged in this work. 我1949年到这里，从那时起我就担任这项工作。 ③We came back on Tuesday, since when we have been working in the repair shop. ④We came a week ago, since when the weather has been bad. 四、when 还可用作名词，前面常常用定冠词 the。 the when 表示事 件发生的时间,常常与 the where, the how 并列使用。 He told the police the when and the how of the accident. 他告 诉警察事故发生的时间及发生的原委。 ［巩固练习］ 1. I remember ______ this used to be a quiet village. A. when B. how C. where D. what 2. Why do you want a new job _____ you've got such a good one already? A. that B. where C. which D. when 3. It was an exciting moment for these football fans this year, ______ for the first time in years their team won the World Cup. A. that B. while C. which D. when 4. We are living in an age _______ many things are done on computer. A. which B. that C. where D. when 5. The reporter said that the UFO ______ east to west when he saw it. A. was travelling B. travelled C. had been travelling D. was to travel 6. ______ got into the room _________ the telephone rang. A. He hardly had; then B. Hardly had he; when C. He had not; than D. Not had he; when 7. ---- Can I join your club, Dad? ---- You can when you _______ a bit older. A. get B. will got C. are getting D. will have got 8. I shall never forget those days ________ I lived in the countryside with the farmers, ________ had a great effect on my life. A. that; which B. when; which C. which; that D. when; who 9. The film brought the hours back to me ______ I was taken good care of in that faraway village. A. until B. that C. when D. where 10. He was about to tell me the secret ______ someone patted him on the shoulder.

主将从现及练习

主将从现 概念： 在时间状语从句和条件状语从句中，主句用一般现在时从句则用一般现在时表示一般将来。 适用条件：1.主句和从句的动作都是将来要发生的动作 2.在时间状语从句和条件状语从句中 时间状语从句的关联词有： after在-----以后，before在-----以前when当----的时候，as soon as一-----就------ until到----为止 条件状语从句的关联词有： if如果和unless除非，如果不 首先要分清主句和从句： 如： When I grow up, I will be a nurse and look after patients. I want to be a doctor when I grow up. 注意： 无论主句和从句都可以在前面或者后面，紧跟在关联词后的才是从句。 其次，还要注意主句的各种变体。主句可以是标准的将来时： will+动词原形或者be going to+动词原形也可以是一下两种情况： 1、如果主句是祈使句，那么从句通常要用一般现在时 如：

Don’t laugh at me when I make a mistake. 我犯错误的时候不要笑话我。 2、如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时 如： You should be quiet when you are in the reading room. 最后： 当主句是过去将来时时，从句用一般过去时表示过去将来。He said that he would have another try if he had the chance. I knew he could help me if he was free the next day. 请用正确的形式填空。 2. If it is fine, we___( go ) for a walk. 3. If it rained, they _____ ( stay ) at home. 4. You will spoil it if you ___ ( not be ) careful. 6. Will you help me if I ___ ( need ) you. 7. They will get wet if it ___ ( rain ). 8. What a pity I haven’t got my car. If I had, I _____( take ) you to theairport. 9. We would answer if we ___( can ). 10. If you eat too much, you ___( get ) ill.

连词when的用法

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”。 （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。 （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。 （1 ）The days are gone forever when the Chinese people were looked down upon. 中国人民被人轻视的日子一去不复返了。 （2 ）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。 （3 ）Considering （the time）when these paintings were done，they are in excellent condition. 考虑到这些油画的创作时期，它们保存的状况是极好的。 （4 ）Do you remember （the time）when the three of us went on a picnic？你还记得我们三个人去野餐的那段时光吗？ A. 在定语从句中，that 在某些条件下可用来代替when ，这时其先行词通常是time，

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.

通过高考题精讲when引导的状语从句

通过高考题精讲when引导的状语从句 (2013安徽) It’s much easier to make friends________ you have similar interests. A. unless B. when C. even though D. so that 解析：本题选择B. 本题考查状语从句。 It’s much easier to make friends________ you have similar interests. A. unless B. when C. even though D. so that 通过句意看：表时间。 句意：当你们有相似的兴趣的时候，就更容易交朋友。

（2004上海） Jasmine was holidaying with her family in a wildlife park _____ she was bitten on the leg by a lion. A. when B. while C. since D. once 解析：本题选择A. 本题考查状语从句。 Jasmine was holiday ing with her family in a wildlife park _____ she was bitten on the leg by a lion. A. when B. while C. since D. once 通过句意看：表时间。 常用固定句型：..be doing……when….. 句意：jasmine正在和家人在野生公园度假，就在那时她的腿被狮子咬了一口。 (1988) _____got into the room, _____the telephone rang. (A)He hardly had, then (B) Hardly had he, when (C)He had not, than (D) Not had he, when

主将从现-知识讲解-“主将从现”适用于什么样的从句中

主将从现知识讲解“主将从现”适用于什么样的从句中 所谓的“主将从现” 第一层次，即“主句用将来时（现在将来时和过去将来时），从句用一般时（一般现在时和一般过去时）”,这一层次也可以称作“初中层次”。 第二层次：“主将”中将来时有将来进行时，将来完成时，将来完成进行时，而“从现”中相应的时态也可能是现在进行时，现在完成时，现在完成进行时。 例如： If the snow has completely stopped, we will be playing with snow on the playground. 如果雪能够完全停下来，我们将正在操场上玩雪呢！ If it is snowing, we will have been walking in the snow for more than two hours. @ 如果天一直在下雪，我们将在雪地里走了两个多小时了。 另外，引导条件状语从句的连接词（connector）还可以是unless, so long as, in case, on condition that, supposing that, provided that 等。 if引导条件状语从句的两种用法： 第一种用法： 当某事发生的可能性较大时，这种情况，有个十三字口诀：“主将从现，主过将从过，主现从现”。即主句是一般将来时，从句用一般现在时；主句用过去将来时，从句用一般过去时；当主句中有can/can’t的话，则从句用一般现在时。例如： If he has time, he will come tomorrow. If she finishes early, she can come back early. ； If you don’t do homework, the tea cher will scold you. 第二种用法： 1.if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如: If I were you, I would invite him to the party. 如果我是你,我会邀请他参加聚会。 I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车,我会到的早一点儿。

when 的用法

我手里关于when用法的资料全再这了. 一、 when 意为“当…时”,用作连词,引导时间状语从句,从句的谓语动词可以是延续的（此时相当于while）,也可以是非延续性的.引导的时间状语从句通常用现在时表将来. I will write to my sister when I have finished the book.我读完这本书后便给姐姐写信. When he sees the photo,he can't help thinking of his childhood. 每当看到这张照片,他就不禁想起童年. 二、 when 引导时间状语时,若主从句主语一致或从句主语为it且从句谓语动词含be的形式,可省略从句的主语及be 部分. When (I was) walking on the street,I came across Mary.我在街上漫步时遇上了玛丽. He gave good practical advice when (he was) asked.他有求必应,给出了好的可行性建议. She would weep when (she was) alone.她孤独时便哭. When（you are）in trouble,you can ask her for help.有麻烦时,你可找她帮忙. We will do that only when ( it is) necessary.只有当有必要时我们才会那么做. 三、 when用作连词,表突然发生某事,意为“就在这时/那时”（=at this/that time）,常构成句型be doing…when…或be about to do…/be on the point of doing…when…. I was just coming along to see you when I ran into Tom.遇见汤姆时,我正在来看你的路上. He was about to go to bed when the telephone rang.他准备睡觉时电话铃响了. 四、 When用作连词表过早发生某事,意为“还没（刚刚）…就”,可构成句型hardly/scarcely…when….使用该句型时应注意两点：①主句的谓语动词用过去完成时,从句谓语动词用过去时.②若hardly/scarcely 位于句首时,其后的句子部分倒装,而when引导的从句不倒装. I had been there little more than a week when I set to work in earnest. 我在那还不到一个星期就开始认真工作. Hardly had I opened the door when he hit me.我一打开门他就撞了我. 六、 when引导条件状语从句,意为“在…情况下；如果；要是”,相当if. Why do you walk when you have a car?你有车为什么还走路呢? No one can make a dress when they haven't learnt.没有人能够不学就能制作衣服的. 七、 when 引导时间状语从句,意为“一…就…”,相当于as soon as . We will start when everything is ready.一切准备好了我们就出发. When she comes,I will give it to her.她来了我就给她. 八、 when可引导原因状语从句,意为“既然；考虑到…”,相当于since,as 或now that. You can't go home when you haven't finished your work. 既然你没完成工作,你就不可以回家. 九、 when可引导名词性从句或接不定式. Could you tell me when you will leave for Shanghai?能告诉我你什么时候去上海吗? Ask him when to open it.告诉他什么时候打开. 十、

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。

主将从现常见的有以下六种情况

常见的有以下六种情况： 一、如果主句是将来时或表示将来含义时，那么条件和时间状语从句多用一般现在时 如：When I grow up, I will be a nurse and look after patients/ I want to be a nurse and look after patients. 我长大后要当一名护士，照顾病人。 二、如果主句是祈使句，那么从句通常要用一般现在时 如：Don’t laugh at me when I make a mistake. 我犯错误的时候不要笑话我。 三、如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时 如：You should be quiet when you are in the reading room 在阅览室时应保持安静。 四、如果if的条件状语从句遇到变换间接和直接时, 祈使句应用not to.... 如; She said not to close the window 常见的时间状语从句的连词有：as soon as,when,while ,as,until等 五、主将从现说的是在含有时间状语从句和条件状语从句的主从复合句中，如果主句的时态是一般将来时，那么从句要用一般现在时。 例如：I will tell him about it when he comes. If it is fine tomorrow, we will go outing. 六、如果主句的时态是过去将来时，那么从句要用一般过去时。例如： He said that he would have another try if he had the chance. I knew he could help me if he was free the next day. 主要标志有：if 、unless 、until、when 、as soon as等 If引导的条件句（if翻译成"如果"的时候）

(完整word版)when和while用法小结

连词while的用法 连词while的用法有好几种，使用时不可掉心轻心，它大数有以下几种用法： 1、表示时间，意思是“当……的时候”，while可以位于句首，也可以位于句中。 我们在看电视时，她一个人在房间里读小说。 ，the telephone rang . 他正在整理行装，电话铃响了。 ，she fell asleep . 她听着收音机睡着了。 While引导从句时，如主句和从句的主语一致，从句的谓语又含有be，那么从句的主语和be可省略，While 后可直接跟现在分词、名词、形容词或介词短语。 a. We are students while ( we are ) serving as teachers. 我们一面当老师，一面当学生。 b. While (he was )yet a youth he gained many prices. 当他还是个青年时，他就多次获奖。 c. She never dreams 她睡着时从来不做梦。 d. Tom had an accident 在来这儿的途中，汤姆出了事故。 2、表示对比或转折，意思是“而”，这时，While一般位于句中，如： Kate was dressed in green while Jenny was dressed in red .凯特穿绿色衣服，而詹妮穿绿色衣服。 She likes singing and dancing while her brother would rather read novels …, 而她弟弟喜欢小说。 Young people are like the sun rising in the east while old people are like the sun setting in the west .年轻人犹如旭日东升，而老年人犹如日薄西山。 a. She though I was talking about her daughter , in fact , I was talking about my daughter .(NMET’95) A. whom B. where C. which D. while b. I do every single bit of housework my husband Bob just does the dishes now and then .[04广西] A．since B．while C．when D．as 3、表示让步，通常用在句首，意思是“尽管”、“虽然”，如： While he had a handsome income, h e couldn’t afford to buy a piano.他虽然收入不少，但卖不起钢琴。 While they are my neighbours, I don’t know them well. 尽管他们是我的邻居，但我不了解他们。 ，I think they went too far.我虽然同情他们，但也感到他们做得有些过分了。 ，he was not loved. 他虽然受到尊敬，但没有受到喜爱。 ，he is very strict with them . 虽然他爱他的学生，可是他对学生们很严格。 4、表示条件，意思是“只要”（=as long as）. While 可以位于句首，也可以位于句中。 You don’t have to worry while we are here .只要我们在，你就别着急。 There will be life while is water and air. 只要有空气和水，就有生命。 While there is life, there is hope. 留得生命在，不怕没希望。 5、“同时，也”. While the book is welcomed by scholars, it will make an immediate appeal to the general readers. 这本书受到学者的欢迎，同时也会引起一般读者的兴趣。 6、“趁着”. Make hay while the sun shines.晒草要趁阳光好。（谚）strike while the iron is hot.趁热打铁。（谚）While the roses are yet in bloom , will you come with me to see them?趁着玫瑰花还开着，你我一道去看好吗？ 1.——I am going to the post office ——you’re there ,can you get me some stamps ?(99) A．as B．while C．because D．If 2.the WTO cannot live up to its name it does not include a country that is home to one fifth of mankind .(2000) A．as long as B．while C．If D．even though 3. I know the money is safe , I shall not worry about it .(03北京) A．Even though B．Unless C．while D．As long as 4. We were told that we should follow the main road we reached the central railway station .(04辽宁) A．Even though B．until C．while D．wherever 5. modeling business is by no means easy to get into, the good model will always be in demand.(04浙江) A．While B．Since C．As D．If 6. I accept that he is not perfect, I do actually like the person.(04 湖南) A．While B．Since C．As D．Unless 7. The cost of living in Glasgow is among the lowest in Britain, the quality of life is probably one of the highest.(06 天津) A．since B．when C．as D．while 8. I really don’t like art , I find his work impressive.[07山东]A．As B．since C．If D．while 9. In some places women are expected to earn money men work at home and raise their children .[08四川] A．but B．while C．because D．though 10. the Internet is of grea t help ,I don’t think it’s a good idea to spend too much time on it .(08湖南) A．If B．while C．Because D．As 11.－Are you ready for Spain? ---Yes, I want the girls to experience that they are young.(08年上海) A．while B．until C．if D．before 高考英语when 的用法命题走向与解题策略 [高考走向] When 的用法在高考中也是重现率较高的语言点，尤其是when用作关系副词来引导定语从句。综观近几年的高考英语试题，其考查方式多通过“单项填空”进行，偶尔也出现在“短文改错”和“完形填空”中。 一、When(at that time)用作副词 1．用作关系副词，引导定语从句起状语作用，既不能作动词的宾语，也不能作介词的宾语。译为“当…时”相当于“介词at, in, on, during+which结构”