条件状语从句公开课课件

finishes 3. He can go home if he ________ (finish) his homework.
• 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： I’ll 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。
原句可改为： I will travel around the world if I h enough money ..
Look and say I will see a doctor __________________ if I’m ill.
If I’m late, I will be punished. _________________.
Part1:If 的用法
1.I want to know if he will go to a park with us. 宾语从句 2. We will have a picnic if it doesn’t rain. 条件状语从句 3. Can you tell me if there will be a concert tomorrow? 宾语从句
Exercises :
wants
3. I don’t 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; D comes
4. If you feel tired, you must have a
rest.
条件状语从句
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。 如 果 Betty will visit the History Museum if it ____________ doesn’t rain (rain) tomorrow. Ben wants to know if it___________ will be (be) fine tomorrow. 是否
“If he doesn’t _______ study hard. He ____ will _____ fail in the exam.”
If I have much money, I will…………
travel all over the world.
buy lots of delicious food.
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 don’t 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 didn’t agree. She said ,“ if there is only one man left, I will marry you.”
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.
Don’t cross the road if the light is red You must stop if the traffic light is red.
1. Put up your hands if you _____ have (have) any questions. is (be) cold tomorrow, I will 2. If it ____ wear my sweater.
he ,come, next weekend,
I ,tell you
If he comes next weekend, I will tell you.
not rain ,
go hiking ,this afternoon
If it doesn’t rain, I will go hiking this afternoon.
Look and say
If you get up late, you will be late for school.
二.if引导的条件状语从句位置 例句If I have enough money, →从句 →主句 I will travel around the world
：
结构：
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。
summary
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
if she, call me,
will I, tell her about it
If she calls me, I will tell her about it.
(C) 4. If it ______ sunny tomorrow, I ____ boating. A. is go B. will be, go C. is, will go D. will be, will go
( B) 5. -- what will you do if it ______ tomorrow, --I’ll stay at home and watch TV. A. rain B. rains C. will rain D. is raining
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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3—4分。
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.
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
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，从句用一般现在时 ___________表示将来 ________原则。 主将从现 例如：We will go to the park if it doesn’t ______ rain (rain) tomorrow. _______
you
If you feel tired, you must have a rest.
3. if 条件状语从句中，主句是祈使句， 一般现在时 表示将来。 从句用____________ _________原则。 主祈从现
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例如：Don’ t wait for me if I
_____ am (be) late.
It is going to rain tomorrow.
I will stay at home.
rains tomorrow, I will stay If it _____ _____ _____ at home.
He won’t study hard.
He will fail in the exam.
1. He will help me with my maths if he ____ D free. A was B will be C would be D is 2. Please tell her my D telephone number if she _____ (want) to know.
If I get up at 7:00, I will be
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。
2. if 条件状语从句中，如果主句有 must，can，may 等情态动词，从 一般现在时 。 句用___________
例如：You must stop if the
traffic light ____ is (be) red.
“
主情从现”
If you feel hungry, should eat something.