if条件状语从句的语法--初中

If you read the instructions carefully, you’ll know what to do.
Activity2.Complete the sentences
— I want to get high scores. — If you work hard, you will do well. __________________________(work hard/ do well)
If you don’t eat some breakfast, you’ll get hungry at school.
2) Hurry up! We’ll be late!
ຫໍສະໝຸດ Baidu
If you don’t hurry up, we’ll be late.
3) Read the instructions carefully. Then you’ll know what to do.
If I’m late, I will say sorry _________________.
If it rains tomorrow, will watch TV at home I_____________________. play basketball I won’t________________. doesn’t rain If it _____________ tomorrow,
If 条件状语从句（1） 句型结构
祈使句+if条件状语从句 if条件状语从句，+祈使句（从句后加逗号）
时态
if条件状语从句要用一般现在时。
Let’s sing the song in Chinese:
If you are happy
What will you do if you’re happy?
1.-how can I remember my friends’ birthdays? you keep a note in your diary, you won’t forget. -If_______________________________________ (keep a note in your diary / not forget).
5.-Is it OK if I watch TV for six hours? you watch too much TV, your eyes will hurt. -If_______________________________________ (you watch too much / eyes hurt).
句子特点： 1.if从句中用一般现在时，表示未来的一种条件， 从句中可以加时间状语。 2.当if表示未来的条件时，主句中用一般将来时。 句型结构： 主句+if条件状语从句 if条件状语从句，+主句（从句后加逗号） 3.时态：if一般现在时，+主句一般将来时或 （can/ may /must +v.)
I’ll play basketball ________________.
practice
If you are free this weekend, what will you do ?
If I am free ,…
sleep watch TV play computer games
if条件状语从句(2)
I worry so much about my schoolwork.
---If you always work hard,
you won’t worry about your schoolwork.
You should work hard!
Unit 3 activity 1 Rewrite the sentences with if:
Giving suggestions:
---I’m always tired in the morning.
---If you go to bed early, you won’t be tired in the morning.
---I get thirsty when I run.
---If you take some water with you, you won’t get thirsty when you run.
If
Look and say If I’m hungry, eat some food I will______________.
If I’m tired, have a rest I will_____________.
Look and say If I’m ill, I will see a doctor __________________.
e.g. 1.If you don’t get up early, you will be late for school .你如
果不早点起床，上学就会迟到。
2. If I play games on it , it will go wrong .
如果我用它玩游戏，它就会坏掉。
3. If you finish the homework， you can go home． 如果你作业做完了就可以回家了。 4. If you want to lose weight you must/should eat less bread. 如果你想减肥，你必须少吃面包。 5.If you heat ice it turns to water. (也可用will turn) 如果把冰加热，它就会化成水。
if条件句歌诀
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,主句多用将来时； 条件句表事实,主句常用现在时。 if条件句有特点,现在时把将来替； 这个规则要牢记!

will do 1.If he____________ (not, do it ), I___________(do) it. doesn’t do
(2) if从句+主句（一般将来时）
3.非真实条件句（虚拟语气）：表示不可实现的条件 或根本不存在的条件。
从句多用一般过去时或过去完成时，表示对现在或 过去的一种假设。 e.g. If I were you , I would invite him to the party .如果 我是你，我会邀请他参加聚会。 If he had hurried ,he could have caught the train . 如果他抓紧点，他会赶上火车的。
3.-I don’t like speaking English outside the classroom. you don’t practice, you won’t improve. -If_______________________________________ (not practice / not improve). 4.-Should I tell my teacher I don’t understand the homework? you don’t tell her, she won’t be able to help you. -If_______________________________________ (not tell her / she not able to help you).
will be 2.If you ____ (be) late for school ,my teacher ________(be) angry. are 3 If she________ (win) the prize ,we _______(be) happy. wins will be don’t eat will get 4.If I _________ (not,eat )so much ,I _________(get) thinner. 5.If you ______(tell) them, they _____________ (not,believe) you. tell won’t believe rains 6 I _________(stay) at home,If it __________( rain). will stay 7.If it ____________(not,rain) ,I _________( go) out. doesn’t rain will go 8. we __________(play) football, If it is _________(sun) . will play sunny 9.If she __________(become) a star ,her parents ____________ becomes won’t send (not,send) her away 10.He will watch _________(watch) TV ,if he ______(be) free. is
I’m happy, I will clap my hands ____________. stamp my feet If I’m happy, I will ____________. nod my head If I’m happy, I will ____________. If I’m happy, I will ______________. wink my eyes
2.-It’s late, but I don’t want to go to sleep. you don’t get enough sleep, you’ll feel tired at school. -If _______________________________________ (not get enough sleep/ feel tired at school).
Listen in class, or you won’t understand what to do.
If you don’t listen in class, you won’t understand what to do.
1) Eat some breakfast, or you’ll get hungry at school.
If I were to go abroad ,I would go to America.
如果我出国了，我会去美国。
exercises
（ B ）1. Be careful, if you______ want to make mistakes. A. won’t B. don’t C. didn’t D. not （ C ）2. Work hard if you ______ to get a good mark. A. wanted B. wanting C. want D. will want （ A ）3. --I want to know if you______ to the party tomorrow. -- I will if I_____ free. A. will come; am B. come; am C. will come; will be （ D ）4. I don’t know if______ tomorrow. A. it doesn’t rain B. the rain will stops C. the rains won’t stop D. it won’t rain （ B ）5. The volleyball match will be put off (推迟） if it ______. A. will rain B. rains C. rained D. is raining ( C ) 6. ─Mike wants to know if ____ a picnic tomorrow. ─Yes. But if it _______, we'll visit the museum instead. A. you have/ will rain B. you will have/ will rain C. you will have/ rains D. will you have/ rains ( D ) 7. I really don't know if she _______ it when she ________. A. finds/ arrives B. finds/ will arrive C. will find/ will arrive D. will find/ arrives
if的用法
1.引导宾语从句：译为“是否”，表示不确定的概 念。 I don’t know if your father can come together .
Can you tell me if miss your parents ?
2.引导条件状语从句：译为“如果，假如”
(1) if从句+祈使句
If从句（条件状语从句）
Complete the sentences with the correct form of the words.
1.If you _______(listen) to the music, _____ listen buy (buy) a CD. 2. If he______ (be) late for school, don’t wait ______ is (not wait ) for him. buy get 3. If you ____ (buy) a new camera, ____ (get) a good one. doesn’t come 4. If the light ____________ (not come) on, ____ (wait) for one minute. wait