if条件状语从句的语法-初中.ppt

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1、If从句（条件状语从句）从句（条件状语从句）Complete the sentences with the correct form of the words.1.If you _(listen)to the music,_(buy)a CD.2.If he_(be)late for school,_(not wait)for him.3.If you _(buy)a new camera,_(get)a good one.4.If the light _(not come)on,_(wait)for one minute.isbuygetdoesnt comewaitdont wait li

2、stenbuy祈使句祈使句+if条件状语从句条件状语从句 if条件状语从句，条件状语从句，+祈使句（从句后加逗号）祈使句（从句后加逗号）if条件状语从句要用一般现在时。条件状语从句要用一般现在时。句型结构句型结构时态时态If 条件状语从句（条件状语从句（1）LetssingthesonginChinese:If you are happyWhatwillyoudoifyourehappy?vIfImhappy,Iwill_.vIfImhappy,Iwill_.vIfImhappy,Iwill_.vIfImhappy,Iwill_.clapmyhandsstampmyfeetwinkmyeyes

3、nodmyheadIf Im hungry,I will_.If Im tired,I will_.Look and sayeat some foodhave a restIf Im ill,_.I will see a doctorLook and sayIf Im late,_.I will say sorry If it rains tomorrow,I_.will watch TV at homeIf it _ tomorrow,_.Ill play basketballdoesnt rainI wont_.play basketballIfyouarefreethisweekend,

4、whatwillyoudo?IfIamfree,sleepwatch TVplay computer gamespracticeif条件状语从句条件状语从句(2)句子特点：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。从句中可以加时间状语。2.当当if表示未来的条件时，主句中用一般将来时。表示未来的条件时，主句中用一般将来时。句型结构：句型结构：主句主句+if条件状语从句条件状语从句 if条件状语从句，条件状语从句，+主句（从句后加逗号）主句（从句后加逗号）3.时态时态：if一般现在时，一般现在时，+主句一般将来时或主句

5、一般将来时或（can/may/must+v.)e.g.1.If you dont get up early,you will be late for school.你如你如果不早点起床，上学就会迟到。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。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。如果你作业做完了就可以回家了。4.If you want to lose weight you must/sho

6、uld eat less bread.如果你想减肥，你必须少吃面包。如果你想减肥，你必须少吃面包。5.If you heat ice it turns to water.(也可用也可用will turn)如果把冰加热，它就会化成水。如果把冰加热，它就会化成水。vif条件句不一般条件句不一般,几个要点记心间。几个要点记心间。v条件句放在前条件句放在前,逗号要放句中间。逗号要放句中间。v条件句表可能条件句表可能,主句多用将来时；主句多用将来时；v条件句表事实条件句表事实,主句常用现在时。主句常用现在时。vif条件句有特点条件句有特点,现在时把将来替；现在时把将来替；v这个规则要牢记这个规则要牢记!

7、if条件句歌诀条件句歌诀1.If he_(not,do it),I_(do)it.2.If you _(be)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 eatwill gettellwont believe6 I _(stay)at home,If it _(ra

8、in).7.If it _(not,rain),I _(go)out.8.we _(play)football,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 rainwill gowill playsunnybecomeswont sendwill watchisdoesnt dowill do-Im always tired in the morning.-If you go to be

9、d early,you wont be tired in the morning.Givingsuggestions:-I get thirsty when I run.-If you take some water with you,you wont get thirsty when you run.I worry so much about my schoolwork.-If you always work hard,you wont worry about your schoolwork.You should work hard!Unit 3 activity 1 Rewrite the

10、 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,youll

11、 get hungry at school.If you dont hurry up,well be late.If you read the instructions carefully,youll know what to do.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_(keepanoteinyourdiary/notforg

12、et).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.3.-IdontlikespeakingEnglishoutsidetheclassroom.-If_(notpractice/notimprove).4.-ShouldItellmyteacherIdontunderstandthehom

13、ework?-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.if的用法的用法2.引导条件状语从句：引导条件状语从句：译为译为“如果，假如如果，假如”(1)if从句从句+祈使句祈使句(2)if从句从句+主

14、句（一般将来时）主句（一般将来时）1.引导宾语从句引导宾语从句：译为：译为“是否是否”，表示不确定的概，表示不确定的概念。念。I dont know if your father can come together.Can you tell me if miss your parents?e.g.If I were you,I would invite him to the party.如果如果我是你，我会邀请他参加聚会。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。如果他抓紧点，他会

15、赶上火车的。If I were to go abroad,I would go to America.如果我出国了，我会去美国。如果我出国了，我会去美国。3.非真实条件句（虚拟语气）非真实条件句（虚拟语气）：表示不可实现的条件：表示不可实现的条件或根本不存在的条件。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。过去的一种假设。()6.Mikewantstoknowif_apicnictomorrow.Yes.Butifit_,wellvisitthemuseuminstead.A.youhave/willrainB.

16、youwillhave/willrainC.youwillhave/rainsD.willyouhave/rains()7.Ireallydontknowifshe_itwhenshe_.A.finds/arrivesB.finds/willarriveC.willfind/willarriveD.willfind/arrives（）4.Idontknowif_tomorrow.A.itdoesntrainB.therainwillstopsC.therainswontstopD.itwontrain（）5.Thevolleyballmatchwillbeputoff(推迟）ifit_.A.w

17、illrainB.rainsC.rainedD.israining（）1.Becareful,ifyou_wanttomakemistakes.A.wontB.dontC.didntD.not（）2.Workhardifyou_togetagoodmark.A.wantedB.wantingC.wantD.willwant（）3.-Iwanttoknowifyou_tothepartytomorrow.-IwillifI_free.A.willcome;amB.come;amC.willcome;willbeD.come;willbeexercisesBCADBCD 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