Unit10Grammar语法if引导的条件状语从句课件2024-2025学年人教版英语八年级上册

if为连词，意为“____”，引导____(时间/原因/条件)状语从句。 条件状语从句：表示主句动作发生的前提或条件的从句。 If you study hard, you will get good grades. if引导的条件状语从句 If you go to the party, you will have a great time! 如果你去参加聚会，你会玩得开心！ 如果 条件 从句 主句 If you take the bus to the party, you’ll be late. You will be sorry if you don’t go to the party. If you go to the party with Tom, you’ll have a good time. What will happen if it rains? Where is “从句 ”？ If he gets up at 9:00, he will be late. If I am late, the teacher will be angry with me. 1. 在 if 引导的条件状语从句中，如果主句是______________，那么if 引导的从句用_____________来表示将来, 也就是所谓的___________。 If she is happy, she will play the guitar . 观察 if 引导的条件状语从句主句和从句时态如何？ 一般将来时态 一般现在时态 主将从现 主将 从现 主将 从现 主将 从现 主句用_____(will/be going to)表示将来，不应该用_____________表示将来。 结构：If+__________时，主语+___________+动原. (主将从现) will be going to 一般现在 will/won’t If（从句） （一般现在时） 主句 （一般将来时） 1. is, are , am 1. will +V原 2. isn’t, aren’t, am not 2. won’t do 3. 动原, 动词三单 4. don’t/doesn’t+动原 I will go hiking this afternoon if it doesn't rain tomorrow. if引导条件状语从句，既可放在主句前面，也可放在主句后面。 如果放在句首，从句后面要加逗号和主句隔开。 If it doesn’t rain, I will go hiking this afternoon. 位置： If从句,主句. 主句if从句. 位置： 主将从现 1. If it rains tomorrow, we _______ (stay) at home. 2. If he isn’t available tomorrow, he __________ (not come) to your birthday party. 3. What _________(happen) if everyone has a robot? 4. If the rain _____(stop) tonight, we will go to the cinema. 5. If he ______(come) tomorrow, I will be happy. 6. If I ____(be) free tomorrow, I will visit my parents. 6. If it ______ ____ (not rain) tomorrow, he will go fishing. will stay won’t come will happen doesn’t rain stops comes am 主将从现 1. ________ you drive, you will not be late for work. A. If              B. Unless  (除非)    C. Though D. Or(否则) 2. There is going to ______ a sports meeting next week. If it _______, we’ll have to cancel it . A. be, doesn’t rain B. have, will rain C. be, rains D .have, rains 主将从现 3. I’m waiting for my friend. ______, I’ll go shopping alone. A. If she comes B. If she isn’t come C. If she doesn’t come D. If she didn’t come 主将从现 4. If she ____ angry with you, she will leave at once without ________. A. is; saying something B. isn’t; saying anything. C. is; saying anything D. isn’t; saying something. 主将从现 观察 if 引导的条件状语从句主句和从句时态如何？ She can get good grades if she studies hard. If he has free time, he should read English. You must stop if the traffic light is red. 2. if 条件状语从句中，如果主句有must，can，may，have to 等情态动词，从句用__________，________原则。 一般现在时 主情从现 1. He can’t pass the exam if he _____________(not study) hard. 2. She may be late if she _____(take) a bus. 3. If you ____ (be) ill, you must go to the doctor. doesn’t study takes are 观察 if 引导的条件状语从句主句和从句时态如何？ Work hard if you want to get good grades. If he comes, please let me know. Don’t wait for me if I am late. If she _____(come) tomorrow, please tell me. If it ______(rain) tonight, let’s stay at home. Have a rest if you ____(be) tired. Don’t come if he ___________(not call) you. comes 3. if 条件状语从句中，主句是祈使句，从句用____________表示将来。_________原则。 主祈从现 一般现在时 rains are doesn’t call I’ll tell you if she comes. 如果她来我会告诉你。 I don’t know if she will come tomorrow. 我不知道她明天是否回来。 当if 翻译成“是否”时，主将从现原则不适用 Unless we talk to someone, we’ll certainly feel worse. =If we don’t talk to someone, we… (unless除非，如果不=if …not…) We can get good grades as long as we work hard. (as long as 只要) 引导条件状语从句： 1. if(如果) 2. unless(除非，如果不) 3. as long as(只要) 都符合_______，________，________原则。 主将从现 主情从现 主祈从现 句型转换： 1. 祈使句+and/or+句子（一般将来时） and表顺承，or表转折，意为“否则，不然” Study hard and you will pass the exam easily. 努力学习，你将很容易通过考试。 =If you study hard, you will pass the exam easily. Get up early or you will be late. 早点起床不然你就会迟到。 =If you don't get up early, you will be late. 2. 借助with或者without来转换条件状语从句。 Fish will die without water. =If there is no water, fish will die. With your help, I will finish the work soon. =If you help me, I will finish the work soon. should should为_____动词，意为“___________”，后加________，___(有/无)人称和数的变化。常用来征询意见，建议，劝告，要求和义务等。否定形式为__________ 基本句式： 1. 肯定句：主语+______+_____+其他。 She should say sorry. 情态 应该，应当 动词原形 无 shouldn’t should 动原 2. 否定句：主语+________+____+其他。 You shouldn't smoke in the hospital. 3. 一般疑问句：______+主语+____+其他？ Should you fight with your classmate? 4. 特殊疑问句：疑问词+一般疑问句？ What should I do next? shouldn’t 动原 Should 动原 1 The students will go to the Summer Palace if it ___________ (not rain) tomorrow. 2 If he _________(walk) to school, he’ll be late. 3 If she ______(take) a bus, she _________(arrive) at school on time. 4 If you play computer games on weekdays, you _______ (be) tired. 5. If she ______(work) hard, she must ____(get) good grade. 6. If you like reading, ______(read) loudly and more. 7. If it _____ ( rain )tomorrow, I will play the piano. walks rains takes will arrive will be works get read 能力提升 学以致用 独立完成下面填空,黑板展示，全班纠错 doesn’t rain Exercises Fill in the blanks with the words given. 1.If you ________(play) computer games on weekdays, you _________ (be) tired. 2.If he ___________ (study) hard, he __________ (get) good grades. 3.The students _________(go) to the park if it ___________ (not rain) tomorrow. 　 play will be studies will get will go doesn’t rain 1. if条件句 1)She__here on time if the train isn't late. A. gets B. get C. got D. will get 2)What__________(happen)if she______(watch)TV at the party? 3)Half the class won't come if we have the class meeting today. _____ ___ ____if we have the class meeting today? 4)If it______(rain)tomorrow, I'll stay at home. 5)If he_______(walk)to school, he'll be late. D will happen watches What will happen rains walks 6)If he____(has)enough time tomorrow, he_______(go)to the party. 7)The students will to to the Summer Palace if it__________(not rain)tomorrow. 8)If you_______(work)hard, your dream will come true. 9)If you play computer games on weekdays, you______(be)tired. 10)If there is any change to the plan, I__you as soon as possible. A. told B. have told C. tell D. will tell has will go doesn't rain work will be D 11)Mary, could you tell me if there___a sports meeting tomorrow? I think if it__tomorrow, the sports meeting will be put off. A. is going to be, will rain B. was, rains C. is going to be, rains D. was, will rain 12)You like. You can saty to dinner. __________________________________. 13)She comes late. Her teacher isn't happy. ____________________________________. C If you like, you can stay to dinner. If she comes late, her teacher won't be happy. 14)She doesn't come to my house. I go to the library. ______________________________________. 15)Do you know if__back next week? If he__back, please let me know. A. he comes, will come B. will he come, comes C. he will come, comes D. will he come, will come I will go to the library if she doesn't come to my house. C 16)Don't__jeans to the party. A. wear B. put on C. wearing D. dress 17)Your mother prepared dilicious food for us yesterday. Please say thanks__her. A. for B. to C. with D. of 18)If you study harder, you will__go to college. A. can B. are able to C. be able to D. must 19)We'll go to the Great Wall if it__________(not rain)tomorrow. 20)If it is fine tomorrow, I_______(go)for a field trip. A B C doesn't rain will go 21)We will have no water to drink__we don't save water now. A. until B. before C. though D. if 22)I am going to Korea for my summer holiday tomorrow. __. A. Have a good time B. I'm sorry to hear that C. It's a pleasure D. That's right. 23)You__late if you__to the party. A. be, walk B. be, will walk C. will be, walk D. will be, will walk D A C 24)He's going to wear jeans__the party, but I think they won't let him__. A. in, in B. to, to C. in, to D. to, in 25)Why not__a party this Friday? That sounds like a good idea. A. to have B. have C. having D. had 26)I wonder if it is going to rain next week. If it__, I will have to stay at home. A. si B. does C. do D. will 27)Paul will take his cat to the classroom. His teacher won't let him in. __Paul__his cat to the classroom, his teacher___ __him in. D B B 28)Your dream will come true__you put your heart into it. A. if B. although C. until D. whether 29)In Chongqing youcan often see many people dance outside together if it__in the evening. A. rains B. doesn't rain C. will rain D. won't rain 30)We are not sure if it__tomorrow. If it__, we won't go hiking. A. will rain, rains B. will rain, will rain C. rains, rains D. rains, will rain A B A 31)I_______(ask)the teacher for help if I don't understand. 32)You can't get good grades if you_________(not work)hard. 33)You must stop if the traffic light___(be)red. 34)Don't go out if you__________(not finish)your homework. 35)If I_____(be)free, I'll visit my grandparents this weekend. 36)If anyone__, tell him I'm not at home. A. calls B. call C. will call D. is calling will ask don't work is don't finish am A 37)If it won't rain tomorrow, I'll go fishing. 38)Finish your homework and you can watch TV.(同义句) ___you_____your homework, you___be able to watch TV. 39)Get more exercise, and you will be healthy.(同义句) If you______ ____more exercise, you won't be healthy. 40)We believe to do nothing is the worst thing. We believe the worst thing is___ ___ _____. If finish will don't get to do nothing 41)Ride you bike or you'll be late.(用unless改写) You won't be late unless you_____ ____ ___. 42)Work hard and you'll pass the exam. You'll pass the exam____ ___work hard. 43)__I call you a taxi? No, thanks. The weather is fine and I'd like to walk home. A. Should B. Must C. Would D. Might ride your bike if you A $$