2018年高考英语一轮复习每日一题第15周结果状语从句含解析

2018年高考英语真题分类汇编专题15-16：语法填空与短文改错(含解析)According to a review of evidence in a medical journal。

runners live three years longer than non-runners。

You don't haveto run fast or for long to see the benefit。

You may drink。

smoke。

be overweight and still ce your risk of dying early by running.While running regularly can make you live longer。

thereview says it is more effective at XXX walking。

cycling or swimming。

Two of the authors of the review also made a study published in 2014 which showed that a mere five to 10 minutes aday of running ced the risk of heart disease and early deaths fromall causes.XXX best exercise is one that you enjoy and will do。

but otherwise。

it'XXX。

you can run on soft XXX.Running is a great form of XXX。

All you need is a pair of good running shoes and a willingness to get started。

Running isnot only cheap。

高考英语状语从句知识点全集汇编含答案解析(4)一、选择题1．---I’d like to play football with you, but I have an important thing to attend to.---If you don’t go, ________.A．neither do I B．so will I C．nor will I D．so do I2．He differed _________ other people __________ he always looked further ahead in his work. A．from; in which B．from; in that C．with; in which D．with; in that 3．Just underwater grass floats on the surface if it loses its roots, a nation is lost without its memories.A．since B．while C．as D．when4．House prices vary from place to place and are usually high ______ there are famous schools. A．where B．when C．which D．whether5．The leaders of Catalonia said that he had decided to delay the declaration of independence______ they could have a further negotiation with Spanish government.A．in case B．in order to C．so that D．not until6．I was so proud _______ my team won the ice hockey competition. It made me feel like I could achieve anything.A．while B．when C．before D．until7．The young lady rushed into the room _____ she heard the noise.A．right away B．at once C．immediately D．at the moment 8．______ you lose in life, don’t lose faith and hope, with which you can live a happy life and achieve your goals.A．Whenever B．Wherever C．Whatever D．Whoever9．The purpose of the research project has a more different meaning for them than _________. A．that for us B．it has for us C．it did for us D．it did for ours 10．You should take control of your life _________ it is planning coursework or picking a major. A．whenever B．whether C．whatever D．no matter11．The sales of houses in our city fell by 40 percent last month, and it will be 48 percent ______ we don’t count low-price houses provided for poor residents.A．as B．unless C．if D．before 12．Manchester United has decided that Wayne Rooney will not be sold to any other club no matter how much money is offered or ______ the potential risks of keeping an unhappy player. A．however B．whether C．what D．whatever13．In the global economy, a new drug for cancer, ________ it is discovered, will create many economic possibilities around the world.A．whatever B．whoeverC．wherever D．whichever14．Elephants usually won’t attack a person ________ one becomes a danger to them.A．until B．although C．unless D．when15．It won't be long _our summer vacation begins, but my vacation plans are still up in the air. A．when B．until C．that D．before16．Peter had been puzzled over the problem for over an hour___________ all at once the solution flashed across his mind.A．when B．while C．then D．as17．Tom was so angry____ he heard his friend betrayed him____ he tore the letter into two immediately.A．that; when B．that; that C．when; what D．when; that 18．So sudden ________that the enemy had no time to escape.A．did the attack B．the attack didC．was the attack D．the attack was19．_____ never easy, innovation is absolutely possible with adequate training and continuous practice.A．When B．As C．Since D．While 20．—Why didn’t you try to finish the composition?— I tried to, but ________ I could, the bell ran announcing the end of the examination.A．until B．whenC．after D．before21．________ birds use their feathers for flight, some of their feathers are for other purposes. A．Once B．If C．Although D．Because 22．Some pressure is good for you ________ it can help you try harder.A．unless B．althoughC．before D．as23．You won’t find paper cutting difficult _____you keep practicing it.A．even if B．as long as C．as if D．ever since24．________ the job takes a significant amount of time, most students agree that the experience is worth it.A．If only B．AfterC．Although D．In case25．––Why does Jack Ma still work so hard he has already owned so much money?–– Maybe he pursues more than money.A．while B．as C．when D．before【参考答案】***试卷处理标记，请不要删除一、选择题1．C解析：C【解析】【分析】【详解】考查倒装和条件状语从句。

2018－2019学年一轮复习高考英语语法状语从句详解一、时间状语从句常用引导词：when（在…时）, as（当…时）, while（在…期间）, as soon as（一……就……）, before（在…之前）, after（在...之后）, since（自从...以来）, not...until（直到…才）until/till(直到…时）等特殊引导词：the minute, the moment, the second, every time, the day，the instant（瞬间，顷刻）, immediately , directly （不久，立即）, no sooner …than（一...就...）, hardly …when（刚一...就...）, scarcely …when（刚...就.../一...就...）,as soon as(一…就…)。

当用no sooner …than，hardly …when，scarcely …when作为引导词的时候，从句要部分倒装。

I didn’t realize how special my mother was until I became an adult.直到我成为了一个成年人我才意识到我的母亲是多么的特殊。

While John was watching TV, his wife was cooking.当约翰看电视时，他的妻子正在做饭。

The children ran away from the orchard(果园), the moment they saw the guard.孩子们一看到守卫就逃出了果园。

No sooner had I arrived home than it began to rain.我一到家就开始下雨了。

Every time I listen to your advice, I get into trouble.每当我听取你的建议时，我就会惹上麻烦。

状语从句1. 在主从复合句中修饰主句中的动词，形容词，副词等的从句叫状语从句。

可分为，时间状语从句，地点状语从句，原因，目的，结果，条件，让步，比较和方式状语从句。

2. 时间状语从句起时间状语作用的句子；可放在句首，句中和句尾常用引导词：when，while, as, after, before, since, till, until, the moment, hardly … when , no sooner … thanwhen, while, as的用法1) when 用法最广，常可代替while和as, 在while 引导的从句中，动词只能是延续性的When the fire broke out, all the students were sleeping soundly.The telephone rang while I was taking a bath.2) 当两个表示时间延续的动作同时发生而又有对比意味的时候，用while，在这样的复合句中，主句从句的时态通常是相同的。

Father was preparing a report while I was playing PC games.3) 常用as的情况：一边…一边；表示随着短暂动作的发生，另一行为伴随发生As he talked on, he got more and more excited.They talked as they walked along the river.My cap was blown away as I sat down.until和till的用法表示“一直到…”时，主句和从句都用肯定式；I will wait until/ till the concert is over.表示“直到…才…”是，主句用否定，从句用肯定式。

They can’t go until Sunday.since的用法He has written to me frequently since he was ill. 自从他病好以来，他常写信给我。

that与which引导的定语从句高考频度：★★★★☆难易程度：★★★★☆1.Please send us all the information ________ you have about the candidate for the position.A. thatB. whichC. asD. what 【答案】A【解析】考查定语从句。

先行词是information，指物，关系词在从句中作及物动词have的宾语，且先行词用不定代词all修饰，关系词只能用that，故选A。

2.was given three books on cooking, the firstA. of thatB. of whichC. thatD. which【答案】B【解析】考查定语从句。

因the first与three books之间是部分与整体的关系，因此应用介词of，且介词后只能用which，不用that。

（3）先行词既有人又有物时，关系代词只用that，不用which.如：☞The scientist and his achievements that you told me about are admired by us all. 我们所有人都钦佩你告诉我的那位科学家和他所取得的成就。

☞The foreign visitors spoke highly of the pioneers and their performances that they saw at the Children’s Pala ce. 外国游客高度赞扬了他们在少年宫所看到的少先队员以及他们的表演。

（4）关系代词在限定性定语从句中作表语并带有类比含义时，通常只用that，不用which.如：☞He is no longer the star that he was.他不再是过去的那位明星了。

☞Our school is no longer the school that it used to be.我们的学校不再是以前的那所学校了。

2018年高考英语真题专题汇编从句1.如果我们不阻止气候变化，世界上许多动植物将会消失。

条件状语从句通常由if或unless引导。

条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。

2.她和她的家人骑自行车上班，这有助于他们保持健康。

非限制性定语从句即可修饰主句的一部分，也可以修饰整个主句。

其引导词的选择和限制性定语从句的判断规则一致，即：第一、找准先行词；第二、看先行词在定语从句中所作的成分。

需要注意的是，that不能引导非限制性定语从句。

3.在任何不安全的情况下，只需按下按钮，一个训练有素的特工就会为您提供所需的帮助。

祈使句+and/or+陈述句是一种常见结构。

当前后两部分间为承接关系时，用and；前后意思为相反关系时，用or。

该句式中的陈述句部分常用一般将来时态。

4.如果没有他的支持，我们不可能达到现在的位置。

这是一个名词性从句，用where引导，表示我们所处的位置。

因此选C。

5.这就是我父亲教给我的——始终面对困难，抱最好的希望。

这是一个名词性从句，用what引导，作为主语。

因此选D。

6.14.只有当汽车在我们房子前停下来，我们才看到在乘客位置的XXX。

这是一个强调句，强调时间状语only when the car pulled up in front of our house。

因此选B。

7.The gold medal will be awarded to whoever wins the first place in the bicycle race。

The use of "whoever" XXX.8.Let's wait until this weekend so that these peaches can get sweet enough to be eaten。

The use of "so that" emphasizes the purpose of waiting until the peaches are ripe.9.Kae。

Ⅰ。

单句填空1．________you are aware of the trick used in advertisements, I don’t think you are eager to buy.【解析】句意:一旦你意识到广告中使用的技巧，我认为你就不急于购买了。

once是用来引导条件/时间状语从句的,意为“一旦”。

【答案】Once2．Online information helps you a lot with house－hunting。

But you can’t really tell if you’ll like a place________you see it.【解析】句意：网上信息在你买房上可以给你很大帮助，但是直到你亲眼看到了那个地方后，你才能真正说出你是否喜欢那个地方.分析句子结构可知应填until,not..。

until直到……才.【答案】until3．Many people believe we are heading for environment disaster________we basically change the way we live。

【解析】句意：许多人认为除非我们从根本上改变我们的生活方式，否则，我们会走向因环境问题而引起的灾难。

unless意同“if。

.。

not"，意为“如果不”。

【答案】unless4．There is nothing wrong with turning on the TV______watching it doesn't keep you from doing something important.【解析】句意：如果它不妨碍你做一些重要的事情，打开电视看没什么错.if表假设，符合题意.【答案】if5．We all need knowledge from the past—________it comes from personal experience or from studying history。

2018北京市高考英语逐题解析2018年北京市高考英语逐题解析第一部分：知识运用（共两节，45分）第一节单项填空（共15 小题，每小题1 分，共15 分）从每题所给的A、B、C、D 四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

例: It’s so nice to hear from her again. ______, we last met more than thirty years ago.A. What’s moreB. That’s to sayC. In other wordsD. Believe it or not答案是D。

1. - Hi, I’m P eter. Are you new here? I haven’t seen you around.- Hello, Peter. I’m Bob. I just ______ on Monday.A. startB. have startedC. startedD. had started【答案】 C【翻译】—嗨！我是Peter。

你是新来的么？我之前没见过你。

—嗨！Peter。

我是Bob。

我周一刚来。

【解析】本题考查时态；句子中的时间状语是on Monday，但并不知道周一是过去、现在还是将来，所以还是要根据句意去推测表达意图，说话人想说的周一是过去的时间，且表示过去的一个事实结果，所以选择一般过去时态；故正确答案是C。

2. ______ we don’t stop climate change, many animals and plantsin the world will be gone.A. AlthoughB. WhileC. IfD. Until【答案】 C【翻译】如果我们不制止气候变暖，那在世界上的很多动植物都会消失。

【解析】本题考查状语从句从属连词的选择；根据句意可知是条件状语从句；故正确答案是C。

2018届高考英语一轮复习训练试题及答案high B twenty –metre highC twenty metre highD twenty metres high16 ----- Has John arrived yet? ----- No, she _______ an hour agoA was supposed to eB must have eC should eD ought to have e17 In those days, whenever I had difficulties, I _______Mr Shen for helpA used to go toB was used to go toC would go toD used to going to18 If the work _______ by the end of the month is delayed, the construction pany will be finedA being pletedB have been pletedC to be pletedD will be pleted19 What surprised me most was not what he said but _____ he said itA the wayB in the way thatC in the wayD the way which-- Mary has broken the secret, you know?---- No ________, she wouldn’t have kept silent at the meetingA As a resultB In that caseC First of allD In fact21 The weather report says it will ________ cold tomorrowA turn upB turn outC turn onD turn in22 _______ will the life in the future ______?A Ho, likeB What , be likeC What, is likeD Ho, be like23 More and more people are signing up for Yoga classes nowadays , _______ advantage of the health and relaxation benefits。

201８年高考英语一轮复习每日一题（第15周)时间状语从句(含解析）编辑整理:尊敬的读者朋友们：这里是精品文档编辑中心，本文档内容是由我和我的同事精心编辑整理后发布的，发布之前我们对文中内容进行仔细校对,但是难免会有疏漏的地方，但是任然希望(2018年高考英语一轮复习每日一题(第１５周）时间状语从句(含解析)）的内容能够给您的工作和学习带来便利。

同时也真诚的希望收到您的建议和反馈，这将是我们进步的源泉,前进的动力。

本文可编辑可修改,如果觉得对您有帮助请收藏以便随时查阅，最后祝您生活愉快业绩进步，以下为2018年高考英语一轮复习每日一题（第１５周）时间状语从句（含解析)的全部内容。

时间状语从句高考频度：★★★★☆难易程度:★★★★☆１.（20１7·北京卷·单项填空)If yｏu ｄoｎ’t understand someｔhing，ｙoｕ may reｓearcｈ，study, ａnd talk ｔo oｔhｅr pｅoｐlｅ __＿＿___ you fiｇｕre iｔ out.Ａ. bｅｃauｓe ﻩB． thoｕgｈﻩﻩ C. uｎｔｉl ﻩＤ。

since【答案】C【解析】A. bｅｃausｅ因为 B. thougｈ尽管 C. until 直到D。

ｓiｎce自从。

句意:如果你无法理解某个东西，你可能会去研究，学习并和他人探讨直到你解决为止，根据句意可知选用uｎtil“直到”，选Ｃ.2。

(2016·全国新课标卷IＩI·语法填空)Oveｒtiｍe, 45 ｔhe populatioｎgrew, people ｂｅgａn ｃuttinｇfoｏd inｔo smａll pieces so it would coｏk morｅ quickly。

【答案】as／wheｎ3。

(２016·四川卷·语法填空)Tｈe motheｒheｌd thｅbaby iｎ hｅr froｎt ｐaws much the way a huｍａｎｄoes。

衔接点15 状语从句（初高考点差异及衔接）初中要求初中简单学习时间、地点、原因、条件、目的、结果、让步、比较和方式状语从句【初中状语从句考点聚焦】一．选择题1.I will try my best to help you，I don’t know what to start with yet.A.whetherB.sinceC.thoughD.until答案C考查连词。

逗号前说“我会尽最大努力帮你”，逗号后说“我还不知道怎么开始”。

逗号前后是让步关系，应用though引导让步状语从句。

故选C。

2. astronauts go on spacewalks，they wear spacesuits to keep themselves safe.A.ThoughB.TillC.WhenD.Unless答案C考查时间状语从句的引导词。

though虽然，尽管;till直到……为止;when当……时候;unless除非。

此处表示“当宇航员在太空行走时”。

故选C。

3.—It is impossible to finish the difficult task in such a short time on my own both of us work together.—No problem. Let’s start!A.ifB.butC.becauseD.unless答案D考查条件状语从句的引导词。

“我独自在这么短的时间内完成这项艰难的任务是不可能的”，而完成任务的条件是“我们两个人一起做”，空格处引导条件状语从句，unless“除非”符合语境。

故选D。

4.Dad sometimes goes to the supermarket with us he hates going shopping.A.becauseB.soC.thoughD.if答案C考查让步状语从句的引导词。

设空处前的“Dad sometimes goes to the supermarket with us”与设空处后的“he hates going shopping”为让步关系，用though引导让步状语从句，故选C。

目的状语从句高考频度：★★★★☆难易程度：★★★★☆Cathy had quit her job when her son was born _______________ she could stay home and raise her family.A. now thatB. as ifC. only ifD. so that【答案】D【名师点睛】本题考查连词so that 的用法，此类辨析题需掌握引导状语从句的连词的不同含义并结合语境，本题中的so that引导目的状语从句。

意思是：以致，为了，以便于。

这个词组还可以和in order that，in order to，so as to 进行替换。

所以做好此类题要先分析前后两个句子的关系，了解具体语境中的连词的意思，从而判断出正确的选项，学生要记得积累每一题中所出现的连词的意思，不能只看其表面。

注意有的连词的意思并不是表面上的那样，如果出现不熟悉的词语，应该采用排除法，而不是直接看表面意思来选答案。

【考点解读】1. in order that引导的目的状语从句in order that＂为了；以便＂。

多用于正式文体，通常可以与so that换用。

They stopped at Hangzhou in order that they could go around West Lake. 他们在杭州停了下来，以便游览西湖。

The expert spoke slowly in order that everyone should understand. 专家讲得很慢，以便人人都能听得懂。

2. so (that)引导的目的状语从句so that＂为了；以便＂。

so that通常可以与in order that换用，它所引导的目的状语从句总是放在主句之后，在非正式文体中，常省略that。

Speak clearly so that they may understand you. 你要讲得清楚，他们才可能听得懂。

高考英语状语从句知识点知识点总复习附答案解析(3)一、选择题1．It won't be long _our summer vacation begins, but my vacation plans are still up in the air. A．when B．until C．that D．before 2．Manchester United has decided that Wayne Rooney will not be sold to any other club no matter how much money is offered or ______ the potential risks of keeping an unhappy player. A．however B．whether C．what D．whatever 3．Why do many students stick to private tutoring _____ they could easily master such knowledge at school?A．unless B．before C．after D．when4．______the damage is done, it will take many years for the farmland to recover.A．UntilB．UnlessC．OnceD．Although5．_____ I once made some mistakes, I won’t spend a moment of the future regretting what might have been.A．Until B．While C．Unless D．Because 6．Believe it or not, some English idioms are very difficult to understand ______ you know the meaning of each word.A．as if B．in case C．now that D．even if 7．—Shall I ________ the raincoat?—No hurry. Leave it ________ it is. It looks like rain.A．put away; in the place B．put away; whereC．put on; where D．put on; there8．-I’d like to find a job in the library.-Good idea, ______ it doesn’t affect your studies.A．now that B．as soon as C．as long as D．even if9．Do not make complaints about being left out___you shy away from sharing your joys and sorrow with others.A．when B．unless C．once D．until10．I was so proud _______ my team won the ice hockey competition. It made me feel like I could achieve anything.A．while B．when C．before D．until11．The young lady rushed into the room _____ she heard the noise.A．right away B．at once C．immediately D．at the moment 12．He hasn’t got any hobbies，________you call watching TV a hobby.A．when B．ifC．unless D．since13．The people in the mountain village treated us like old friends _________ we were strangers to them.A．so that B．as if C．even though D．as long as 14．—Nowadays some parents keep their children under their wings. These helicopter parents even protect their children from the knowledge ________ they have failed.—Absolutely. They should know that setbacks and failures are part and parcel of adolescent growth.A．where B．when C．that D．which15．Peter had been puzzled over the problem for over an hour___________ all at once the solution flashed across his mind.A．when B．while C．then D．as16．Many adults agree that teenagers shouldn't live alone they have their parents’ permission. A．if B．unless C．in case D．now that17．So sudden ________that the enemy had no time to escape.A．did the attack B．the attack didC．was the attack D．the attack was18．They decide to have more workers for the project ____ it won’t be delayed.A．even if B．as if C．now that D．so that19．He was deeply struck by the natural beauty of the West Lake___________he went to Hangzhou.A．at the first time B．the first time C．for the first time D．at the first time when20．_________ my heart still beats, I will go on working for the people.A．As soon as B．As far as C．As long as D．As much as 21．Incredible ________ it was, it was true.A．although B．though C．even though D．despite22．____________ China has made advances in 5G technology, there is still a long way to go for its popularity.A．If B．Because C．Since D．While23．________ the job takes a significant amount of time, most students agree that the experience is worth it.A．If only B．AfterC．Although D．In case24．Human beings are different from animals________they can use language as a tool to communicate.A．in which B．in thatC．for that D．for which25．_______ hip-hop is popular with youngsters, I’m still not accustomed _______ it.A．As, to appreciating B．Although, to appreciateC．Even though, to appreciating D．While, to appreciate【参考答案】***试卷处理标记，请不要删除一、选择题1．D解析：D【解析】【分析】【详解】考查状语从句。

高考英语新状语从句知识点知识点总复习附答案(2)一、选择题1．In boxing, players should wear gloves and mouth guards ________ anything dangerous happens.A．in vain B．in a word C．in debt D．in case2．Prince Harry and his wife, Meghan, will give up the name “royal” ____ they withdraw fr om official duties and embrace new lives, the couple confirmed on Friday.A．unless B．while C．as D．although3．A Chinese company has created a new facial recognition system that can identify people______ they are wearing masks.A．provided that B．in case C．as though D．even if4．All bad things must come to________end, ________ terrible an experience is.A．the; whatever B．an; however C．/; how D．a; what5．_____ I once made some mistakes, I won’t spend a moment of the future regretting what might have been.A．Until B．While C．Unless D．Because6．Just underwater grass floats on the surface if it loses its roots, a nation is lost without its memories.A．since B．while C．as D．when7．I was so proud _______ my team won the ice hockey competition. It made me feel like I could achieve anything.A．while B．when C．before D．until8．The young lady rushed into the room _____ she heard the noise.A．right away B．at once C．immediately D．at the moment 9．_____I had more money, I could buy a car.A．Only if B．If ever C．If only D．Even if10．____ I look back to those days as a child, I really hope to spare more time to accompany my father.A．However B．Whenever C．Whatever D．Wherever 11．Many countries have a Mother’s Day, ________ they don't always fall on the second Sunday in May.A．when B．though C．as D．once12．- Have you known each other for long?- Not really. ________ we started to work in this school.A．Just after B．Just when C．Ever since D．Just before13．______the phone call, the construction site is crowded with workers full of joy and excitement.A．On receiving B．As soon as receiving C．The Moment he receivedD．Receiving14．—Nowadays some parents keep their children under their wings. These helicopter parents even protect their children from the knowledge ________ they have failed.—Absolutely. They should know that setbacks and failures are part and parcel of adolescent growth.A．where B．when C．that D．which15．_________I saw him, I knew he was the man the police were looking for.A．The place B．The week C．The day D．The instant 16．__________, he is famous for writing blogs.A．As he is a teacher B．A teacher as he isC．Teacher although he is D．Teacher as he is17．—Why didn’t you try to finish the composition?— I tried to, but ________ I could, the bell ran announcing the end of the examination. A．until B．whenC．after D．before18．________ birds use their feathers for flight, some of their feathers are for other purposes. A．Once B．If C．Although D．Because19．My parents live in a small village. They always keep candles in the house _____ there is a power out.A．if B．unlessC．in case D．so that20．You can phone your friend at work _____ you don’t make a habit of it.A．as if B．even though C．as long as D．in case 21．—Have you known each other for long?—Not very long, ________ we started to work in the company.A．after B．before C．when D．since22．_______relevant departments stressed no plastic covers were used for books, I didn't realize these covers contained harmful chemicals.A．Until B．Unless C．While D．Since23．I'll be out for some time. ______ anything important happens, call me up immediately. A．In case B．As ifC．Even though D．Now that24．The secretary made a note of it _____ she should forget.A．in order that B．in caseC．so that D．ever when25．—Why do people like pop music? I hate it so much.—______ it is not your style, that doesn’t mean it is bad.A．Only if B．Even though C．Nov that D．In case【参考答案】***试卷处理标记，请不要删除一、选择题1．D解析：D【解析】【分析】【详解】考查目的状语从句。

状语从句状语的功用：状语说明地点、时间、原因、目的、结果、条件、方向、程度、方式和伴随状况等。

状语一般由副词、介词短语、分词和分词短语、不定式或相当于副词的词或短语来担当，其位置一般放在句末，但也可放在句首或句中。

常见考点：1. 主句与从句的时态呼应问题；2. 连接词的选择；3. 状语从句与非谓语动词之间的替换；4. 根据从句与主句的逻辑关系选用从属连词。

状语从句类型较多，老师要让学生学会一一辨别、使用哦！一、时间状语从句定义：用表示时间的连词连接一个句子作状语，这样的主从复合句就是时间状语从句。

引导词：when, before, after, while, as soon as, until, since......注意：如果主句是一般将来时，从句只能用一般现在时表示将来意义。

when1. when既可引导一个持续性动作，也可引导一个短暂性动作，可用于表示主句和从句动作同时发生或从句动作先于主句动作，有时还可表示从句动作后于主句，意为“当...时候”。

2. when在be about to do...when...，be doing...when...，had done...when...，be on one’s way...when...，be on the point of doing...when...等结构中，作“那时突然”讲。

3. 表示“既然、鉴于；尽管，虽然（位于主句之后）；如果。

while1. 表示“当...时候”，引导的动作必须是延续性的。

2. 用作并列连词，表示相对关系“然而”。

3. 引导让步状语从句，相当于although,意为“虽然”，位于主句前。

4. 引导条件状语从句，相当于as/so long as，意为“只要”。

as1. 表示“当...时候”，强调同时发生，不指先后。

2. 说明两种正在发展或变化的情况，表示“随着”，表示时间的推移。

3. 表示“一边...一边...”。