中小学英语公开课优质课件推选——《if引导的条件状语从句》.ppt

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1、,if引导的条件状语从句,执教教师：XXX,Grammar,if 从句,UNIT 4,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

2、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

3、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

4、 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

5、，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,

6、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

7、,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”

8、，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 wil

9、l 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

10、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

11、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. wil

12、l 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

13、.,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,