初中语法之条件状语从句精.ppt

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1、初中语法之条件状语从句第1 页，本讲稿共20 页主句+if 条件状语从句 if 条件状语从句，+主句（从句后加逗号）if 条件状语从句要用一般现时。句型结构时态 If 条件状语从句第2 页，本讲稿共20 页If Im hungry,I will_.If Im tired,I will_.Look and sayeat some foodhave a rest第3 页，本讲稿共20 页If Im ill,_.I will see a doctorLook and sayLook and sayIf Im late,_.I will say sorry 第4 页，本讲稿共20 页If it rai

2、ns tomorrow,I_.will watch TV at homeIf it _ tomorrow,_.Ill play basketballdoesnt rainI wont_.play basketball第5 页，本讲稿共20 页Ifyouarefreethisweekend,whatwillyoudo?IfIamfree,sleepwatch TVplay computer gamespractice第6 页，本讲稿共20 页if 条件状语从句(2)句子特点：1.if 从句中用一般现在时，表示未来的一种条件，从句中可以加时间状语。2.当if 表示未来的条件时，主句中用一般将来时。

3、句型结构：主句+if 条件状语从句 if 条件状语从句，+主句（从句后加逗号）3.时态：if 一般现在时，+主句一般将来时或（can/may/must+v.)第7 页，本讲稿共20 页e.g.1.If you dont get up early,you will be late for school.你如果不早点起床，上学就会迟到。2.If I play games on it,it will go wrong.如果我用它玩游戏，它就会坏掉。3.If you finish the homework，you can go home 如果你作业做完了就可以回家了。4.If you want to

4、lose weight you must/should eat less bread.如果你想减肥，你必须少吃面包。5.If you heat ice it turns to water.(也可用will turn)如果把冰加热，它就会化成水。第8 页，本讲稿共20 页v if 条件句不一般,几个要点记心间。v 条件句放在前,逗号要放句中间。v 条件句表可能,主句多用将来时；v 条件句表事实,主句常用现在时。v if 条件句有特点,现在时把将来替；v 这个规则要牢记!if 条件句歌诀第9 页，本讲稿共20 页1.If he_(not,do it),I_(do)it.2.If you _(be)

5、late for school,my teacher _(be)angry.arewill be3 If she_(win)the prize,we _(be)happy.winswill be4.If I _(not,eat)so much,I _(get)thinner.5.If you _(tell)them,they _(not,believe)you.dont eat will gettell wont believe6 I _(stay)at home,If it _(rain).7.If it _(not,rain),I _(go)out.8.we _(play)football

6、,If it is _(sun).9.If she _(become)a star,her parents _(not,send)her away10.He _(watch)TV,if he _(be)free.will stayrainsdoesnt rain will gowill playsunnybecomes wont sendwill watchisdoesnt dowill do第10 页，本讲稿共20 页-Im always tired in the morning.-If you go to bed early,you wont be tired in the morning

7、.Givingsuggestions:第11 页，本讲稿共20 页-I get thirsty when I run.-If you take some water with you,you wont get thirsty when you run.第12 页，本讲稿共20 页I worry so much about my schoolwork.-If you always work hard,you wont worry about your schoolwork.You should work hard!第13 页，本讲稿共20 页Unit 3 activity 1 Rewrite t

8、he sentences with if:Listen in class,or you wont understand what to do.If you dont listen in class,you wont understand what to do.1)Eat some breakfast,or youll get hungry at school.2)Hurry up!Well be late!3)Read the instructions carefully.Then youll know what to do.If you dont eat some breakfast,you

9、ll get hungry at school.If you dont hurry up,well be late.If you read the instructions carefully,youll know what to do.第14 页，本讲稿共20 页Activity2.Complete the sentences I want to get high scores.If _(work hard/do well)you work hard,you will do well.1.-howcanIremembermyfriendsbirthdays?-If_(keepanoteiny

10、ourdiary/notforget).2.-Itslate,butIdontwanttogotosleep.-If_(notgetenoughsleep/feeltiredatschool).you keep a note in your diary,you wont forget.you dont get enough sleep,youll feel tired at school.第15 页，本讲稿共20 页3.-IdontlikespeakingEnglishoutsidetheclassroom.-If_(notpractice/notimprove).4.-ShouldItell

11、myteacherIdontunderstandthehomework?-If_(nottellher/shenotabletohelpyou).5.-IsitOKifIwatchTVforsixhours?-If_(youwatchtoomuch/eyeshurt).you dont practice,you wont improve.you dont tell her,she wont be able to help you.you watch too much TV,your eyes will hurt.第16 页，本讲稿共20 页if 的用法2.引导条件状语从句：译为“如果，假如”(

12、1)if 从句+祈使句(2)if 从句+主句（一般将来时）1.引导宾语从句：译为“是否”，表示不确定的概念。I dont know if your father can come together.Can you tell me if miss your parents?第17 页，本讲稿共20 页e.g.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。If he had hurried,he could have caught the train.如果他抓紧点，他会赶上火车的。If I were to go abro

13、ad,I would go to America.如果我出国了，我会去美国。3.非真实条件句（虚拟语气）：表示不可实现的条件或根本不存在的条件。从句多用一般过去时或过去完成时，表示对现在或过去的一种假设。第18 页，本讲稿共20 页()6.Mikewantstoknowif_apicnictomorrow.Yes.Butifit_,wellvisitthemuseuminstead.A.youhave/willrainB.youwillhave/willrainC.youwillhave/rainsD.willyouhave/rains()7.Ireallydontknowifshe_itwh

14、enshe_.A.finds/arrivesB.finds/willarriveC.willfind/willarriveD.willfind/arrives（）4.Idontknowif_tomorrow.A.itdoesntrainB.therainwillstopsC.therainswontstopD.itwontrain（）5.Thevolleyballmatchwillbeputoff(推迟）ifit_.A.willrainB.rainsC.rainedD.israining（）1.Becareful,ifyou_wanttomakemistakes.A.wontB.dontC.d

15、idntD.not（）2.Workhardifyou_togetagoodmark.A.wantedB.wantingC.wantD.willwant（）3.-Iwanttoknowifyou_tothepartytomorrow.-IwillifI_free.A.willcome;amB.come;amC.willcome;willbeD.come;willbeexercisesBCADBCD第19 页，本讲稿共20 页 If you have some problems in your life,what will you do?ProblemsMr Greens problem?If I have enough money,I will travel around the world第20 页，本讲稿共20 页