if条件状语从句(学校课件).ppt

1、Adverbial Clause of Conditionif 引导的条件状语从句引导的条件状语从句-复习课复习课1高级课件If you are happy, what will you do? If I am happy, I will smile.2高级课件If you become sad, what will you do?If I become sad, I will cry.3高级课件She is doing her homework.If you are hard-working, you will get good grades.She gets good grades.4高级

2、课件If you play computer games on weekdays ,youll be very tired in classyour parents will be sad.you wont get good grades.your eyes will be poor5高级课件She will be late.If she _ to school, she _ _late. She is going to walk to school.walkswillbe6高级课件1) 条件状语从句通常由if或或unless(=if not)引导，从句中常用一般时代替将来时一般时代替将来时，

3、即if或unless后的句子谓语用一般现在时。但是，主句则通常用将来时，情态动词或祈使句。 时态主将从现时态主将从现主句一般将来时，主句一般将来时，从句一般现在时从句一般现在时7高级课件1. 如果主句是一般将来时，从句则用一般现在时。如果主句是一般将来时，从句则用一般现在时。 If it rains（从句），（从句）， I will stay at home. Ill go with you if you dont want to go alone（从句）（从句）. 2.如果主句含有如果主句含有must, may, can 等情态动词，从句也要用等情态动词，从句也要用一般现在时。一般现在时。

4、If you drive too fast, you may have an accident. You must stop if the traffic is red.3. 如果主句是祈使句，从句同样要用一般现在时。如果主句是祈使句，从句同样要用一般现在时。 Dont go and play football if you dont finish your homework. Please call me if he comes next Sunday. if条件状语从句结构及时态条件状语从句结构及时态Revision8高级课件 If 引导条状语从句时，从句中用一般现在时代替一般将来时。1.

5、 If he _(go) to the movies,he wont finish his work.goes 2. If I _(become) a doctor,I can help others. become3. If we _(have )time, we will go to the park tomorrow.have4.如果你去，如果你去， 我也去。我也去。If you go,I will go.5.如果明天下雨，请带雨衣如果明天下雨，请带雨衣。 raincoatPlease take a raincoat if it rains.9高级课件If you are free th

6、is weekend,what will you do ?If I am free ,sleepwatch TVplay computer gamespractice10高级课件If you want to get good marks,do what? Dont do what? If you want to get good marks, _. If you want to get good marks, dont _. study hard listen to teachers carefully. do homework by yourself. copy your homework.

7、 talk in the class cheat in the exams11高级课件If you have enough pocket money, what will you buy? If I have enough pocket money, I _.12高级课件If you invite foreigners to China, where will you go? I will go to _, if I invite foreigners to China.Mount TaiWest lake Hainan 13高级课件 If 条件句的替代形式：条件句的替代形式： （1）祈使句祈

8、使句 + and/or + 陈述句陈述句（谓语动词通常用将来时态）。其（谓语动词通常用将来时态）。其中，中，and表示句意顺承；表示句意顺承；or表示转表示转折，意为折，意为“否则否则”。 e.g. If you work hard, youll pass the exam easily. = Work hard, and youll pass the exam easily. If you dont work hard, youll fall behind others. = Work hard, or youll fall behind others.14高级课件（2）用介词用介词with

9、, without的替代形的替代形式：式： e.g. If there is no water, the fish may die. = Fish may die without water. If you help me, Ill finish my task on time. =With your help, Ill finish my task on time.15高级课件 Activity 1 Rewrite the sentences with if:Listen in class, or you wont understand what to do.If you dont list

10、en in class, you wont understand what to do.1) Eat breakfast, or youll get hungry at school.2) Hurry up! Well be late!If you dont eat breakfast, youll get hungry at school.If you dont hurry up, well be late.16高级课件Activity2.Complete the sentences I want to get high scores. If _(work hard/ do well)you

11、 work hard, you will do well.1.-how can I remember my friends birthdays? -If_ (keep a note in your diary / not forget).2.-Its 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

12、tired at school.17高级课件If 在宾语从句中翻译为在宾语从句中翻译为“是否是否”If 在条件状语从句中翻译为在条件状语从句中翻译为“如果如果”Ill go to see you if I am free next week. I want to know if he is a teacher.whether1. if 在句中的含义不同在句中的含义不同18高级课件2. if 在从句中的位置不同在从句中的位置不同If 引导的宾语从句放在主句之后；而引导的宾语从句放在主句之后；而if引引导的状语从句可放在主句之前也可放在主导的状语从句可放在主句之前也可放在主句之后句之后= If i

13、t doesnt rain, I will go out tomorrow.I will go out tomorrow if it doesnt rain.I dont know if the train has arrived. If 引导的条件状语从句放于句首时多用逗号隔开；引导的条件状语从句放于句首时多用逗号隔开；而而if引导的宾语从句则不能。引导的宾语从句则不能。19高级课件3. 时态要求上有区别时态要求上有区别If 引导条件状语从句的时态为一般现在时引导条件状语从句的时态为一般现在时 记住记住“主将从现主将从现” 1.I want to know if there a sports

14、 meeting next month.doesnt rainwill be2.If it doesnt rain ,well go outIf 引导的宾语从句的时态由主句及本身时引导的宾语从句的时态由主句及本身时态决定；态决定；20高级课件1. Can you tell me if she can come to the meeting ?2. She will not go there if it is rainy tomorrow.3. I cant guess if she will be angry .4. If we help each other , we will get go

15、od results .21高级课件1 If I _(not understand）, I will ask my teacher for help .2 If I _(copy ) your homework , I will cheat myself .3 If she _(not get ) up early , shell miss the early bus .4 If your mother_ (buy) the book for you , it will be good for your study. dont understand copy doesnt get buys22

16、高级课件5. If you _(not work ) hard , you _(not pass) the exam.6. If your brother _(break) the window , he will feel very sorry for that .7. If the computer (not work), mend it please .dont workwont passbreaksdoesnt work23高级课件8. If she _(not be) interested in math, she will find it very boring .9. If yo

17、u _(get ) high scores, your parents will be proud of you .10. If you _(be) happy , we will be happy .isnt getare 24高级课件. I want to know if he _(come)tomorrow, if he _(come), I _(give) the message to him. comes will come will give25高级课件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)

18、if从句从句+主句（一般将来时）主句（一般将来时）(3) if从句从句+主句（含有情态动词）主句（含有情态动词） 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 ?26高级课件1.If you _ to the party, youll have a great time. A. will go B. went C. go D. going2 I _ her the answer if

19、 she _me. A.can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asksCD3. What are you going to do tomorrow? -Well go to the library tomorrow if it _. A. isnt rain B. rain C. wont rain D. doesnt rain4. What will you do if you _ to the old folks home visit? A. go B. went C.going

20、 D. will goAD27高级课件5. If I eat _ food, Ill be very fat. A. too many B. many too C. too much D. much too6. Ill give the book to him if he _ here next Sunday. A. will come B. comes C. is coming D. came 7. There _an English film in our school tomorrow. A. is going to have B. will have C. is going to be

21、 D. has8. Could you tell us where _？ A. will the next Olympic Games held B. the next Olympic Games will be held C. would the next Olympic Games be held D. the next Olympic Games would be heldCCBB28高级课件If引导的非真实性条件状语从句（虚拟语气）引导的非真实性条件状语从句（虚拟语气） (A)与现实事实相反与现实事实相反 主：过去将来时主：过去将来时 从：过去时从：过去时 If they were h

22、ere ,they would help you. (B)与过去事实相反与过去事实相反 主：主：should/would +have +v.(p.p.) 从：从：had+v.(p.p.) E. If he had worked harder ,he would have succeeded.29高级课件BY THE TIME by the time +一般过去时，从句过去完成时 by the time +一般现在时，从句现在完成时30高级课件nerdn.令人厌烦的人；愚蠢的人；落伍的人；电脑迷shrug v.耸肩（表示不知道或不在乎） shrug sth off/aside 不把当回事；对满不

23、在乎；对不予理睬 dirt n.泥土;污垢，污泥;下流想法;恶意中伤的话 His clothes were covered in dirt. 他的衣服沾满了污垢。31高级课件 hand n.手;协助，帮助;（工具等的）把，柄;掌管 vt.传递，交给;搀扶;支持 Several of his colleagues had a hand in his downfall. 他的几位同事对他的下台起了作用。 gratituden.谢意;感激，感谢;感激的样子;恩义He smiled at them with gratitude .他向他们笑了笑表示谢意32高级课件 underestimate vt.低估;看轻;对估计不足;把的价值估计过低 Never underestimate your opponent. 决不可低估你的对手。 impactn.影响;碰撞，冲击，撞击;冲击力 vt.撞击;挤入，压紧;对产生影响the environmental impact of tourism 旅游事业对环境的巨大影响33高级课件