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1、大名三中青年教师优质课大赛,If 引导的条件状语从句,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

2、.,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

3、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,r

4、ain,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

5、. 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

6、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 questi

7、ons.,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

8、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

9、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) fin

10、e 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 is 2. Please tell her my telephone number if she _ (want) to know.,wants,D,D,3. I dont know if my unc

11、le _. 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. rai

12、n 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

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