1、If 引导的条件状语从句 Grammar ? 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 If I get upget up at at 7 7:00, I :00, I willwill be be late.late. If I If I amam late, the teacher late, the teacher willwill be be angr
2、y with me.angry with me. If the teacher If the teacher isis angry with me, angry with me, I I willwill be sad. 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。 IfIf you get up late, you you get up late, you will be will be late for schoollate for school.
3、. Look and sayLook and say 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 sayLook and say If Im late, _.
4、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. 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. rainswillstay He wont study
5、 hard. He will fail in the exam. “If he _ study hard. He _ _ in the exam.” doesnt willfail 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” IfIf you feel
6、 hungry, youyou feel hungry, you shouldshould eat something.eat something. If you feel tired, , youyou must have a resthave 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 u主将从现 u祈使句 u情态动词 I will sing a song if I am happy. Dont cross
7、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 ? 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
8、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 f
9、ine 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
10、 picnic if it doesnt rain. 3. Can you tell me if there will be a concert tomorrow? 4. If you feel tired, you, you must have a have a restrest. 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
11、，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 是否是否 如如 果果 Exercises : 1.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 uncle _. If he _, I will be very
12、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
13、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 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.
