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1、,If从句（条件状语从句）,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,If Im hungry,I will_.,If Im tired, I will_.,Look and say,eat some food,have a rest,If Im ill,_.,I will see a doctor,Look and say,If Im late,_.,I will say sorry,If it rains tomorrow,I_.,will watch TV at home,If it _ tomo
2、rrow,_.,Ill play basketball,doesnt rain,I wont_.,play basketball,If you are free this weekend,what will you do ?,If I am free ,sleepwatch TVplay computer games,practice,grammar,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。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
3、现在时，+主句一般将来时或（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 lose weight you must/should eat less bread. 如果你
4、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。,if条件句不一般,几个要点记心间。条件句放在前,逗号要放句中间。条件句表可能,主句多用将来时；条件句表事实,主句常用现在时。if条件句有特点,现在时把将来替；这个规则要牢记!,if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.,are,will be,3 If she_ (win) the p
5、rize ,we _(be) happy.,wins,will be,4.If I _ (not,eat )so much ,I _(get) thinner.,5.If you _(tell) them, they _ (not,believe) you.,dont eat,will get,tell,wont believe,6 I _(stay) at home,If it _( rain).,7.If it _(not,rain) ,I _( go) out.,8. we _(play) football, If it is _(sun) .,9.If she _(become) a
6、star ,her parents _ (not,send) her away,10.He _(watch) TV ,if he _(be) free.,will stay,rains,doesnt rain,will go,will play,sunny,becomes,wont send,will watch,is,doesnt do,will do,Exercise Time,-Im always tired in the morning.,-If you go to bed early, you wont be tired in the morning.,Giving suggesti
7、ons:,-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 sentences with if:,Listen in class, or you wont
8、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 get hungry at school.,If you dont h
9、urry 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.-how can I remember my friends birthdays? -If_ (keep a note in your diary / not forget).2.-It
10、s late, but I dont want to go to sleep. -If _ (not get enough sleep/ feel tired at school).,you keep a note in your diary, you wont forget.,you dont get enough sleep, youll feel tired at school.,3.-I dont like speaking English outside the classroom.-If_(not practice / not improve).4.-Should I tell m
11、y teacher I dont understand the homework?-If_(not tell her / she not able to help you).5.-Is it OK if I watch TV for six hours?-If_(you watch too much / eyes hurt).,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.,summa
12、ry,if的用法,2.引导条件状语从句：译为“如果，假如”(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 ?,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，
13、他会赶上火车的。 If I were to go abroad ,I would go to America.如果我出国了，我会去美国。,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。,( ) 6. Mike wants to know if _ a picnic tomorrow. Yes. But if it _, well visit the museum instead. A. you have/ will rain B. you will have/ will rain C. you will have
14、/ rains D. will you have/ rains ( ) 7. I really dont know if she _ it when she _. A. finds/ arrives B. finds/ will arrive C. will find/ will arrive D. will find/ arrives,（ ）4. I dont know if_ tomorrow. A. it doesnt rain B. the rain will stops C. the rains wont stop D. it wont rain（ ）5. The volleybal
15、l match will be put off (推迟） if it _. A. will rain B. rains C. rained D. is raining,（ ）1. Be careful, if you_ want to make mistakes. A. wont B. dont C. didnt D. not（ ）2. Work hard if you _ to get a good mark. A. wanted B. wanting C. want D. will want（ ）3. -I want to know if you_ to the party tomorrow. - I will if I_ free. A. will come; am B. come; am C. will come; will be D. come; will be,exercises,B,C,A,D,B,C,D,If you have some problems in your life, what will you do?,Problems,Mr Greens problem?,If I have enough money,I will travel around the world,Thanks for listening.Goodbye.,
