时间状语从句微课市公开课一等奖百校联赛获奖课件.pptx

时间状语从句 引导时间状语从句普通类隶属连词有when（当时），while（在期间），as（当，一边一边），before（在之前），after（在之后），since（从以来），till/until（直到），whenever（不论何时），as soon as（一就）等。第1页时间状语从句eg.1.When I went into the classroom,he was reading.当我走进教室时，他正在看书。2.We must strike while the iron is hot.我们必须趁热打铁。3.He read a newspaper as he went along.他边走边看报纸。4.I will tell you after they leave.于他们走后我再告诉你。5.I told him to come back whenever he wants to.我告诉他什么时候想回来就回来。6.I waited till/until she was back.我一直等到她回来 第2页时间状语从句when,whilewhen,while,as表示主句谓语作和从句谓语动作同时发生或几乎同时发生。when表示点时间时，从句中用短暂性动词；表示段时间时，用连续性动词eg.When I got home,my family were already having dinner.我到家时候，全家已在吃晚饭。（when表示点时间）When they were still talking and laughing,the teacher came in.当他们还在说笑时候，老师进来了。（when表示段时间）He waved a hello when he saw her.当他看见她时候，就挥手打了个招呼。（when表示点时间）When you think you know nothing,you begin to know something.当你认为自己一无所知时候，就开始知道一些事情了。（when表示一段时间）第3页时间状语从句 When1.当when意思是正当时候（即 at that moment）时，when只能跟在前一分句之后。eg.He was about to go to bed when the doorbell rang.他正要上床，突然门铃响了。They were watching the World Cup when suddenly the lights went out.他们正看着世界杯比赛，突然灯灭了。They had just arrived home when it began to rain.他们刚到家，天就开始下雨了。2.有时when表示即使，尽管含义，相当于although或since。eg.He walks when he might take a taxi.尽管能够打，但他还是步行。How can you hope for mercy yourself when you show none 既然你不宽恕他人，你自己又怎能希望得到他人宽恕呢？第4页时间状语从句 whilev while通常表示一段时间，从句中宜用连续性动词作谓语。eg.Strike while the iron is hot.v 趁热打铁。v She fell asleep while she was reading the newspaper.v 她在看报时候睡着了。v while有时能够作并列连词，表示对比，可译成而。v I am fond of English while he likes maths.v 我喜欢英语而他却喜欢数学。v We slept while the captain kept watch.v 我们睡觉而上尉担任警戒。v while有时可引导让步状语从句，意思是即使。v While they love te children,they are strict with them.v 即使他们都爱他们孩子，但却对他们要求严格。vATTENTION:即使during 与 while 意思很相近，不过during是介词，不能引导从句。第5页时间状语从句 as as表示点时间时，从句中用短暂性动词；表示段时间时，用连续性动词。as和when二者经常能够通用。eg.The thief was caught as when he was stealing in the supermarket.小偷在超市行窃时被逮住了。I saw Jim as when he left the meeting room.吉姆离开会议室时候我看到了他。as表示 一边一边，强调从句和主句中两个动作交替进行或同时进行。eg.They talked as they walked.他们边走边聊。He looked behind from time to time as he went.他一边走，一边不时地往后看。as表示伴随 eg.As time goes on,its getting warmer and warmer.伴随时间推移，天气变得越来越暖了。第6页时间状语从句when,while,as使用方法区分 只有当从句表示是段时间，即其谓语动词有连续性特征时，这三者能够通用交换。eg.I got the news on the radio when while as I was having breakfast.我在吃早饭时候从收音机里得悉这一消息。在以下情况下，三者彼此之间不能替换使用：aas更强调同一时间或紧接一前一后或伴伴随改变。eg.We listened to the singer sing as he played the guitar.我们听着歌星边弹吉它边演唱。I thought of it just as you opened your mouth.你一张嘴我就知道你要说什幺 As he grew older,he became less and less active.伴随他年纪增加，他变得越来越不活泼了。第7页时间状语从句 bwhen更强调特定时间，还可表示从句中动作先于或后于主句动作。eg.When I had given Mary the spare ticket,I found my own already gone.当我把多出票给了玛丽时，我才发觉我自己票已不知去向。（从句动作发生在主句之前，注意主从句时态）When I finally got there,he meeting had been on for ten minutes.当我最终赶到那里时，会议已开始十分钟了。（从句动作发生在主句之后，注意时态）第8页时间状语从句cwhile从句只能表示延续动作或状态或主从句中动作对比。eg.She thought I was talking about her daughter,while in fact,I was talking about my daughter.她认为我在谈论她女儿，而实际上，我在谈论我女儿。第9页时间状语从句 d若表示两个短促动作几乎同时发生时，用 as场所多于when。eg.As he finished his speech,the audience burst into applause.他结束演讲时，观众暴发出雷鸣般掌声。第10页时间状语从句 before before表示在一段时间之前。eg.I must finish all the work before go home.回家之前我必须干完全部活。You must first learn to walk before you try to run.在想要跑以前，你得先学会走。He had learned English for three years before he went to London.他去伦敦之前已学了三年英语。before 从句往往带有否定含义。eg.He ran off before I could stop him.我还没来得及阻止他，他就跑掉了。Take it down before you forget it.趁着还没忘记时候就统计下来。第11页时间状语从句after after表示在一段时间之后。eg.Lets play football after school.放学后我们踢足球吧。The sun came out soon after the storm stopped.暴风雨过后很快，太阳出来了。第12页时间状语从句Since since表示自以来。表示动作从过去某一点时间一直延续到说话时间为止。主句中通常为延续性动词现在完成时，since从句中普通用短暂性动词普通过去时。eg.It has been just a week since we arrived here.我们到这儿刚才一星期。Where have you been since I last saw you?自上次我见过你之后，你去了哪里？Since she was young,she has been collecting stamps.她自年轻时起就一直集邮至今。第13页时间状语从句till,until 1Until/till用于必定句时，表示直到为止，主句必须为连续性动词。eg.We shall wait until/till he comes back.我们将一直等到他回来。Everything went well until/till that accident happened.直到发生那意外之前，一切都正常。2 notuntil/till表示直到才，主句通常要用短暂动词，这时until和till可用 before代替。eg.I didnt leave until/till before she came back.直到她回来，我才离开。People do not know the value of their health till until before they lose it 人们直至失去了健康才知其可贵。3当not until位于句首时，主句中主语、谓语要使用倒装语序。eg.Not until she stopped crying did I leave.直到她不哭了，我才离开。4.在强调句型中普通只用until,不用till eg.It was not until she took off her dark glasses that I recognized her.第14页时间状语从句whenever whenever是when强势语，它描述不是一次性动作，而是经常发生习惯性动作。eg.You are always welcome whenever you come.不论你何时来都欢迎。Whenever we met with difficulties,they came to help us.每当我们遇上困难时候，他们就来帮我们。第15页时间状语从句as soon as as soon as.可译为一就，用来表示主从句动作是紧接着发生。eg.He will come and see you as soon as he can.他一有空就来看你。He rushed home as soon as he got the good news.他一得到这个好消息就奔回家。第16页时间状语从句Attention:在时间状语从句中，不能用普通未来时、过去未来时态或未来完成时，而要用对应普通现在时态、普通过去时或现在完成时来代替。eg.Ill telephone you as soon as I get there.我一抵达那里就打电话给你。Dont get off the bus until it has stopped.等车停稳后才下车。第17页If I get up late,I will be late for school.If I dont finish my homework,I wont go to bed.由由if引导从句叫条件状语从句，引导从句叫条件状语从句，if意为意为“假如假如”若主句是普通未来时，从句要用普通现在时若主句是普通未来时，从句要用普通现在时。If you join the band,you will be famous.=You will be famous if you join the band.第18页If you feel hungry,you should eat something.If you feel tired,you must have a rest.第19页If the telephone rings,I will answer it.If you get up late,you will be late for school.Look and say第20页If you are ill,you must go to see a doctor.If you are riding a bike in the street,you must be very careful.第21页