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1、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, _ (buy) a CD. 2. If he_ (be) late for school, _ (not wait ) for him. 3. If you _ (buy) a new camera, _ (get) a good one. 4. If the light _ (not come) on, _ (wait) for one minute.isbuygetdoesnt co
2、me waitdont wait listenbuy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）if条件状语从句要用一般现在时。句型结构时态If 条件状语从句（1）Lets sing the song in Chinese:If you are happyWhat will you do if youre happy?vIf Im happy, I will _. vIf Im happy, I will _.vIf Im happy, I will _.vIf Im happy, I will _.clap my handsstamp my feetwink my e
3、yesnod my headIf Im hungry, I will_. If Im tired, I will_. Look and sayLook and sayeat some foodhave a restIf Im ill,_. I will see a doctorLook and sayLook and sayIf Im late,_.I will say sorry If it rains tomorrow,I_.will watch TV at homeIf it _ tomorrow,_.Ill play basketballdoesnt rainI wont_.play
4、basketballIf you are free this weekend, what will you do ?If I am free ,sleepwatch TVplay computer gamespracticeif条件状语从句(2)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.)e.g. 1.If you dont get up ear
5、ly, 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
6、) 如果把冰加热，它就会化成水。vif条件句不一般,几个要点记心间。v条件句放在前,逗号要放句中间。v条件句表可能,主句多用将来时；v条件句表事实,主句常用现在时。vif条件句有特点,现在时把将来替；v这个规则要牢记!if条件句歌诀1.If he_ (not, do it ), I_(do) it.2.If you _ (be) late for school ,my teacher _(be) angry.arewill be3 If she_ (win) the prize ,we _(be) happy.winswill be4.If I _ (not,eat )so much ,I _
7、(get) thinner.5.If you _(tell) them, they _ (not,believe) you.dont eatwill gettellwont believe6 I _(stay) at home,If it _( rain).7.If it _(not,rain) ,I _( go) out.8. we _(play) football, If it is _(sun) .9.If she _(become) a star ,her parents _ (not,send) her away 10.He _(watch) TV ,if he _(be) free
8、.will stayrainsdoesnt rainwill gowill playsunnybecomeswont sendwill watchisdoesnt dowill do-Im always tired in the morning.-If you go to bed early, you wont be tired in the morning.Giving suggestions:-I get thirsty when I run.-If you take some water with you,you wont get thirsty when you run.I worry
9、 so much about my schoolwork.-If you always work hard,you wont worry about your schoolwork. You should work hard!Unit 3 activity 1 Rewrite the sentences with if:Listen in class, or you wont understand what to do.If you dont listen in class, you wont understand what to do.1) Eat some breakfast, or yo
10、ull get hungry at school.2) Hurry up! Well be late!3) Read the instructions carefully. Then youll know what to do.If you dont eat some breakfast, youll get hungry at school.If you dont hurry up, well be late.If you read the instructions carefully, youll know what to do.Activity2.Complete the sentenc
11、es I want to get high scores. If _(work hard/ do well)you work hard, you will do well.1.-how can I remember my friends birthdays?-If_(keep a note in your diary / not forget).2.-Its late, but I dont want to go to sleep.-If _(not get enough sleep/ feel tired at school).you keep a note in your diary, y
12、ou wont forget.you dont get enough sleep, youll feel tired at school.3.-I dont like speaking English outside the classroom. -If_ (not practice / not improve).4.-Should I tell my teacher I dont understand the homework? -If_ (not tell her / she not able to help you).5.-Is it OK if I watch TV for six h
13、ours? -If_ (you watch too much / eyes hurt).you dont practice, you wont improve.you dont tell her, she wont be able to help you.you watch too much TV, your eyes will hurt.if的用法2.引导条件状语从句：译为“如果，假如”(1) if从句+祈使句(2) if从句+主句（一般将来时）1.引导宾语从句：译为“是否”，表示不确定的概念 。I dont know if your father can come together . Can you tell me if miss your parents ?e.g.If I were
