期末复习状语从句课件2021-2022学年人教版英语八年级下册.pptx

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1、状语从句学习目标Course Objectives1.掌握状语从句的概念2.掌握状语从句的分类及引导词3.掌握过状语从句的用法4.课后练习目录Catalog1.Lead-in2.状语从句的分类3.Summary4.ExerciseLead-in.Lead-in1.小朋友怎么了？2.小朋友为什么哭？3.小朋友在哪哭？PART 02Presentation1.状语从句2.状语从句的分类时间状语从句、条件状语从句、原因状语从句、目的状语从句、让步状语从句、结果状语从句、比较状语从句3.状语从句的引导词 时间状语从句引导词：when,while,as,before,after,as soon as,n

2、otuntil,till,since 1）when当时候,引导的状语从句表示主句的动作和从句的动作同时或先后发生.例：I feel very happy when you come to see me.（先后）When you are crossing the street,you must be careful.（同时）时间状语从句1.when 的用法 注：when也可作并列连词，表示一个动作正在进行时，突然间发生了另外一件事.例：We were working in the chemistry lab,when the lights went out.2）when 引导的时间状语从句中，可

3、以用用延续性动词，也可以用短暂性动词.例：I willvisit my good friend when I arrive.（短暂性）Someone knocked at the door when I was sleeping.（延续性）时间状语从句 while 当时候，引导的时间状语从句强调主句动作发生在从句动作所发生的时间段内，从句的动作必须是延续性动词.例：I was reading while my mother was coking.While we were dancing,a stranger came in.Please dont talk to loud while oth

4、ers are working.2.while的用法注：while 也可以作并列连词，表示转折的关系，相当于but,译为然而.例：I like listning to music,while my brother likes doing sports.as引导时间状语从句时，译为”正当,一边边,随着”等意思。1）表示某事一发生，另一事情随即发生。As the sun rose the fog disappeared.2）表示某事发生的过程中另一事发生。1.As he was speaking there was a loud explosion.2.I heared the murmur of

5、 their voices as I crossed the hall.3）表示两个动作同时发生。1.He smiled as he passed.2.Helen heared the story as she washed.3.We get wiser as we get older.3.as的用法习题演练 Fill in the blanks with“when,while,as”1._you meet a word you dont know,consult the dictionary.2.The students took notes _they listened.3._the wi

6、nd rose,the noise increase.4.She called _I was out.5.We must strike_the iron is hot.6._you have finished your work,you have a rest.7.I was just reading a book_she came into my room.4.until/till引导的时间状语从句1）常译为”直到时”，表示主句的动作发生在从句之前。a.当主句谓语动词是延续性动词时，主句用肯定形式。例：Ill stay here until you come back.b.当主句谓语动词是非

7、延续性动词时，主句用否定形式。notuntil直到才 例：He didnt go to bed until he finished his homework.习题演练 1.-Hurry up.The bus is coming.-Oh,no.We mustnt cross the street_the traffic lights are green.A.after B.while C.when D.until2.Julie didnt leave her office_the police arrived.A.however B.while C.until D.as3.他直到做完作业才去睡觉

8、.He_ _ to bed _ he finished his homework.4.我会待在这里，直到你回来.I_ _here until you _ _.5.before和after引导的时间状语从句before引导的时间状语从句1)常译为“在之前”2)表示主句的动作发生在从句的动作之前。例：We clean the classroom before we leave school every day.It was not long _he left his homework.after引导的时间状语从句1)常译为“在之后”2)表示主句的动作发生在从句的动作之后.例：After you u

9、se plastic bags,you mustnt throw them.6.as soon as 引导的时间状语从句1)译为“一就”2)表示从句的动作一发生，主句的动作马上就发生。主从句时态通常是主将从现；类似还有the minute,the moment等。例：I will tell him about it as soon as he comes back.I will call you as soon as I arrive in.Beijing.习题演练用before和after填空。1.He had left the town the day _she arrived.2.It

10、was not long _he left his hometown.3.I played football_I had finished my homework.4.Please tell her Ill come _I do some shopping.5.It will not be long_we met each other again.7.since的用法1）since 引导的时间状语从句，表示 自.以来，主句用一般现在时或现在完成时，从句用一般过去时。例：I have worked for this company since I graduated.We have been g

11、ood friends _we joined the same football team.2）It is/has been+时间段+since从句（从句用一般过去时）例：It is/has been 2 years since we met last year.It has been 6 years since she graduated from the university.习题演练 1.You never really know whether you could handle failure_you come face to face with it.A.until B.after

12、C.when D.while2.Because of the heavy traffic,it was already time for lunch_she got to her office.A.since B.that C.when D.until3.I was so familiar with him that I recognized his voice_I picked up the phone.A.while B.after C.in case D.the minute4.You cant borrow books from the library_you dont get you

13、r student card.A.before B.if C.while D.as条件状语从句 时态：主将从现，主祈从现，主情从现 条件状语从句引导词：if,unless,as long as1.引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下可能发生。例：1.Ill see a doctor if Im ill.2.well go to the park if it doesnt rain tomorrow.3.If Im late,I will be punished.4.If you get up late,you will be late for schoo

14、l.3.as/so long as 只要 例：1.You may borrow my book as long as you keep it clean.2.So long as youre happy,it doesnt matter what you do.2.unless=ifnot 除非，如果不 例：1.Lets go out for a walk unless you are too tired.=If you are not too tired,lets go out for a walk.2.Unless it rains,the game will be played.条件状语

15、从句 4.条件状语从句的时态(1)if 条件状语从句中，主句用一般将来时时，从句用一般现在时即主将从现。例：If he doesnt study hard,he will fail in the exam.If it rains tomorrow,I will stay at home.(2)if 条件状语从句中，如果主句有must,can,may等情态动词，从句用一般现在时即主情从现。例：You must stop if the traffic light is red.If you feel hungry,you should eat something.(3)if条件状语从句中，主句是祈

16、使句，从句用一般现在时即主祈从现。例：Dont wait for me if I am late.Put up your hands if you have any questions.（3）if的两面性 if 引导条件状语从时译为“如果”，还可引导宾语从句，译为“是否”放在谓语动词之后。请比较：We will go out if it is fine tomorrow.We will have a picnic if it doesnt rain.I want to know if he will go to a park with us.I dont know if he will com

17、e tomorrow.习题演练 1.Betty will visit the History Museum if it_（rain）tomorrow.2.Ben wants to know if it_（be）fine tomorrow.3.Please tell her my telephone number if she _（want）to know.4.He will help me with my maths if he _free.A.was B.will be C.would be D.is5.I dont know if my uncle _.If he _,I will be

18、very happy.A.comes,will come B.will come,will come C.comes,comes D.will come,comes习题演练 1._he was on holiday he caught a bad cold.A.Since B.While C.As D.During2.She will write to you as soon as she _to Paris.A.will get B.gets C.get D.got3._the day went on,the weather got worse.A.When B.Since C.While D.As4.We will be able to get there on time,_our car doesnt break down on the road.A.as long as B.as far as C.as soon as D.as well as5._you have tried it,you cant imagine how pleasant it is.A.Unless B.Because C.Although D.WhenPART 03Summary