英语优质公开课课件精选——《If 引导的条件状语从句》.ppt
,If 引导的条件状语从句,执教教师：XXX,重点、难点1.if 引导的条件状语从句的概念和结构2. 含有if引导的条件状语从句的复合句中主从句的时态。3. If引导的宾语从句与条件状语从句的区别。 考情分析通常在单项选择、完形填空或补全、完成句子等题型中考查，分值约34分。,If I get up at 7:00, I will be late.,If I am late, the teacher will be angry with me.,If the teacher is angry with me, I will be sad.,If 引导条件状语从句,一，定义：if “如果, 假如” 它引导的句子表示某事发生所需的条件，即“在条件下，某事才能发生”，在句子中充当状语，因此称之为条件状语从句。,If you get up late, you will be late for school.,Look and say,语法：,例句If I have enough money, I will travel around the world ：,二.if引导的条件状语从句位置,从句,主句,I will travel around the world if I have enough money .,原句可改为：,if引导的条件状语从句既可以放在句子前，也可以放在句子后。 从句位于主句之前时，常用逗号将其与主句隔开。,结构：,_if Im ill.,I will see a doctor,Look and say,If Im late,_.,I will be punished.,位置：从句可放在主句之前或之后，但是放在主句之前须有逗号隔开,例如：We will go to the park if it _ _ (rain) tomorrow.,Grammar,三， 含if条件状语从句的主从复合句的时态,1. if 条件状语从句中，主句用一般将来 时，从句用_表示将来 _原则。,doesnt,主将从现,rain,一般现在时,It is going to rain tomorrow.,I will stay at home.,If it _ tomorrow, I _ _ at home.,rains,will,stay,He wont study hard.,He will fail in the exam.,“If he _ study hard. He _ _ in the exam.”,doesnt,will,fail,If I have much money, I will,travel all over the world.,buy lots of delicious food.,2. if 条件状语从句中，如果主句有 must，can，may 等情态动词，从 句用_。,例如：You must stop if the traffic light _ (be) red.,is,一般现在时,“主情从现”,If you feel hungry, you should eat something.,If you feel tired, you must have a rest.,例如：Don t wait for me if I _ (be) late.,3. if 条件状语从句中，主句是祈使句， 从句用_表示将来。 _原则。,am,主祈从现,一般现在时,if 引导的条件状语从句时态,主将从现,祈使句,情态动词,I will sing a song if I am happy.,主句,从句,Dont cross the road if the light is red,You must stop if the traffic light is red.,2. If it _ (be) cold tomorrow, I will wear my sweater.,3. He can go home if he _ (finish) his homework.,finishes,1. Put up your hands if you _ (have) any questions.,have,is,趁热打铁,注意事项 1. 在if引导的条件状语从句中，当主句是一般将来时时，不能够使用be going to结构，而要用will。例如： Ill help you with your English if I am free tomorrow. 如果明天我有空，我会帮你学英语。 2. 在if引导的条件状语从句中不能够使用some，而要用any。例如： If you have any questions to ask, please come to my office. 如果你有问题要问的话，请到我办公室来。,四、if的两面性 if引导条件状语从句时意为“如果”，如果引导宾语从句则意为“是否”，放在谓语动词之后。请比较： 1) We will go out if it is fine tomorrow. 2) I dont know if the train has arrived.,A joke,A man liked a girl very much and asked if the girl could marry him. But the girl didnt agree. She said ,“ if there is only one man left, I will marry you.”,Part1:If 的用法,1.I want to know if he will go to a park with us.,2. We will have a picnic if it doesnt rain.,3. Can you tell me if there will be a concert tomorrow?,4. If you feel tired, you must have a rest.,宾语从句,条件状语从句,条件状语从句,宾语从句,Betty will visit the History Museum if it _ (rain) tomorrow.Ben wants to know if it_ (be) fine tomorrow.,If 引导的条件状语从句应遵从主从句是时态相呼应原则，不用一般将来时If 引导的宾语从句主句是一般现在时态，if引导的宾从该用什么时态就用什么时态。,doesnt rain,will be,是否,如果,Exercises :,He will help me with my maths if he _ free. A was B will be C would be D is2. Please tell her my telephone number if she _ (want) to know.,wants,D,D,3. I dont know if my uncle _. If he _, I will be very happy. A comes; will come B will come; will come C comes; comes D will come; comes,D,( ) 4. If it _ sunny tomorrow, I _ boating. A. is go B. will be, go C. is, will go D. will be, will go ( ) 5. - what will you do if it _ tomorrow, -Ill stay at home and watch TV. A. rain B. rains C. will rain D. is raining,C,B,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， 主将从现不一般； 条件句表事实， 主句常用现在时 If还有“是否”意 , 宾语从句放后边,summary,Competition,VS,if will she, call me, I, tell her about it,If she calls me, I will tell her about it.,he ,come, next weekend, I ,tell you,If he comes next weekend, I will tell you.,not rain , go hiking ,this afternoon,If it doesnt rain, I will go hiking this afternoon.,it, be sunny, she, fly a kite,If it is sunny, she will fly a kite.,he,have free time, go to Shanghai ,If he has free time, he will go to Shanghai.,she, study hard, she, get good grades,If she studies hard, she will get good grades.,谢谢观看,请指导,
