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1、表示行为发生的时间，一般由副词，介词短语或相当于副词的词组或短语来充当。For example:He is leaving for ShanghaiI bought a computer The school sports meeting will be held4.I get up 5.He doesnt go to school,tomorrow.,2 days ago.,the day after tomorrow.,at 6 oclock,today.,every day.,时间状语,如果状语不是简单的“单词或短语”，而是句子呢？称为状语从句你来看我，我非常高兴。他敲门的时候，我正在睡
2、觉。eg:I feel very happy eg:I was sleeping.状语从句可位于主句之前，也可位于主句之后。状语从句放在主句之前时，常用逗号分开。状语从句放在主句之后时，一般不用逗号分开。,when you come to see me.,When he knocked at the door,Grammar Adverbial clause of time,时间状语从句：,引导时间状语从句的从属连词有：when,while,as,whenever,before,after,since,till,until,as soon as等引导。,选when？还是as比较像，选while
3、吧！崩溃ING！,when,while和as,1When既可引导一个持续动作，也可引导一个短暂动作，可用于主句和从句动作同时发生或从句动作先于主句动作。当主句是将来时，从句的时态用现在时。（when在实际中用得最多）,take a photo,meet,close,open,come,land,take off,see,arrive,put on,turn off,turn on,call,hear,walk,cook,sleep,write,read,do,study,ride,sing,play,eat,drink,look for,listen,短暂性动词,持续性动词,When the
4、clock struck twelve,all the lights in the streets were still on.When he was at college,he studied very hard.I will see you when I come back from America.He went home when he had finished his homework.,短暂,持续,主将从现,从动前主动后,2while指“在某一段时间里”，“在期间”，引导的动作必须是持续性的;强调主从句动作同时发生（可表对比,译为“而，却”）。While he was readin
5、g,his wife came in.While we were swimming someone stole our clothes.,如果主句的动作在从句的动作过程中发生，从句常用进行时。,Jane was dressed in blue,while Mary was dressed in red.One person may like to spend his vacation at the seashore,while another may prefer the mountains.,3as强调并行发生，不指先后，尤指短动作或事件同时发生;主从句同时,可翻译为”一边一边”,”随着”,
6、强调两个动作紧接着发生。1.The students sang the English song as they went along the road.2.He sang as he worked.3.As he grew older he became more confident.,when,as,while 总结,1、When可指时间点，又可指时间段，从句中可用延续性动词，也可用非延续性动词。2、While总是指一个时间段，从句中必须用延续性动词。3、as多用于平行结构。表示两个动作同时发生：一个主语同时进行两个动作：一种状态随另一种状态的变化而变化。,Fill in the blan
7、k with“when,while,as”1_ you meet a word you dont know,consult the dictionary.2.The students took notes _ they listened.3._ the wind rose the noise increased.4.She called _ I was out.5._you have finished your work,you may have a rest.,when,as,As,while,When,We do not necessarily grow wiser _ we grow o
8、lder._ in Vienna he studied music._ two detectives were keeping guard at the door,two others opened the parcel.He dropped the glass _ he stood up._ I came home,my wife was cooking dinner.,as,While,While,as,When,区别,when从句的谓语动词可以在主句谓语动作之前或同时发生；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。When
9、 he had finished his homework，he took a short rest2.Its cold when it snows.暗示一种规律性，表示“每当”,3.固定搭配中：be doing sth when 正在某事，这时The children were playing football in the ground when it began to rain.孩子们正在操场上踢球，这时开始下雨了。be about to do sth when 正准备做某事，这时I was about to tell her the secret when someone patted
10、 me on the shoulder.我正想告诉她这个秘密，这时有人拍了我的 肩 膀。,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。（主短从延三者都可，主延从短只能用when 和as）When While As we were dancing，a stranger came in（dance为延续性动词）当我们跳舞 时，一位陌生人走了进来。It was raining when/as we arrived.(arrive 为短暂性动作),当主句、从句动作同时进行，从句动作的时间概念淡化，而主要表示主句动作发生的背景或条件时，只能用 as。这时，a
11、s常表示“随着”；“一边，一边”之意。As the time went on，the weather got worse（as表示“随着”之意）,as soon as 的用法,as soon as连接的时间状语从句中，指未发生的动作，规律是：主句一般将来时，从句用一般现在时代替一般将来时（主将从现）I will tell him the news as soon as he comes back。They will be crazy as soon as they hear the news,指紧接着发生的两个短动作，主从句都用一般过去时,1)He took out his English b
12、ooks as soon as he sat down 2)We ate a lot as soon as we got home.,小结：看as soon as 的时态，要么两边都是过去时，要么就是主将从现,Since 自从以来,Sb have/has donesince did自从就已经做了某事eg:I have dreamed about becoming a doctor since I was a child.It is/has been+一段时间since 从句(did)自从以来有It is/has been 3 years since the war broke out.自从战争
13、爆发已经有10年。,Until 直到,We waited until he came back.我们一直等到他回来。She didnt stop working until eleven oclock.她到11点钟才停止工作。如主句动词是延续性动作，常用肯定式，表示“直到为止”;如主句动词是瞬间动词，常用否定式，表示“直到才”,before It will be+一段时间+before从句(do/does)要过才能做It will be three days before you can open the cover of the jar.It will not be+一段时间+before从句 要不了 就能做It will not be ten years before we meet again.It was+一段时间+before从句(did)做了过了It was ten years before we did the experiment.It was not+一段时间+before从句(did)做了没过It was not long before we returned back.,Thankyou,
