if 条件状语从句Grammar.ppt

1、Module 4New technology,Objectives：,带有if的条件状语从句。,Grammar,if 还可以当“是否”讲，主要用于宾语从句，相当于whether，从句的时态根据语境来确定。 而if当“如果”讲，引导的是条件状语从句。,If you want to turn on the recorder, press the blue button. If you like great music, please welcome Sally Maxwell!If the red light doesnt come on, wait for thirty seconds.,Exa

2、mples in this module,if 从句+祈使句,If 引导的条件状语从句(1),1. If 从句的构成,如果想去的话，请告诉我。 If you want to go, please tell me. 如果绿灯没有亮，就等一下。 If the green light isnt on, wait a minute.,如果你想回放的话，按绿色按纽。 If you want to playback, press the green button. 如果要录音的话，按红色按纽。 If you want to record, press the red button. 如果你有空的话，我们去

3、散步吧。 If you are free, lets go out for a walk.,从以上例句中可以看出，If 所引导的从句是一个完整的句子，一定要有主语。,2. If 从句的位置,If 从句表示如果，可以放在主句之前， if从句+, 主句；也可以放在主句之后， 如：,如果喜欢这张照片就把它打印出来。 Print the photo if you like it. 如果照相机出故障就到我们网站上查看。 Look at our website if the camera does not work.,If I play well, Ill play the solo. If the te

4、acher chooses Kylie, shell play the dance music. If she becomes a star, her parents wont send her away.,Examples in this module,由 if 引导的从句叫条件状语从句，if 意为“如果”。若主句是一般将来时，从句要用一般现在时。,If 引导的条件状语从句(2),“主将从现”,时态“主将从现”,1. 主句一般将来shall/will/must/should(肯定/否定）+v.原形时，从句一般现在时,1. 如果你努力工作，你的梦想将会实现。,If you work hard,

5、 your dream will come true.,2. 如果明天下雨，我不会出去散步。,If it rains tomorrow, I wont go out for a walk.,2. if 从句用一般现在时，表示未来的一种条件，从句+时间状语。,If you cant come tomorrow, we can hold the party a little later. 明天你如果不能来，我们可以迟一点举行宴会。 If it doesnt rain tomorrow, well go to the Great Wall. 明天如果不下雨，我们就去长城。,Look and say,

6、用 if 从句描述图片。,If the telephone , I it.,If you late, you late for school.,ring, answer,get up, late,rings,will answer,get up,will be,If you feel hungry, you should eat something.,If you feel tired, you must have a rest.,hungry, eat,tired, have a rest,If you are ill, you must go to see a doctor.,If you

7、 ride a bike in the street, you must be very careful.,ill, see a doctor,ride a bike, be careful,1. Ill call you if he _. A. come B. comes C. coming D. to come,I. 选择填空。,QUIZ,2. If someone comes here, _ yourself behind the tree. A. hid B. hidden C. hide D. hiding,3. Be careful! If you _, an accident m

8、ay happen to you. A. wont B. dont C. arent D. cant,Complete the sentences with the correct form of the words,1. If you _ (receive) a text message, _ (answer) it. 2. If you _ (do) some work on your computer, _(save) it.,receive,answer,do,save,3. If a photo _(be, not ) good, _ (not show ) it to your f

9、riends. 4. If you _ (want) more information, _ (look) on a website. 5. If you _ (cant do ) something the first time, _ (try) again.,is not,dont show,want,look,cant do,try,If they _ _ (be free) free, I will go shopping with them. 2. What will youdo if you_ (find) a panda in danger?,用括号内所给动词或词组的正确形式填空

10、。 注意 if 引导的条件状语从句的用法。,3. If he doesnt study hard, he _ _ _ (not catch up) with his classmates. 4. If it _ _ (not rain) tomorrow, we will go there by bike. 5. If Mike _ _ _ (drop) out of school, we wont go and help him anymore.,are free,find,wont catch up,doesnt rain,drops out of,1. If it _ (rain) to

11、morrow, I wont be happy. 2. If it is _ (sun) next Sunday, I will go traveling. 3. If she _ (understand), she will put up her hand.,rains,sunny,understands,II. 用单词的正确形式填空。,4. If he _ (work) hard, he will pass the exam. 5. _ , you must wait for the green light.,If you want to (across) a street,cross,w

12、orks,Complete the sentences with the correct form of the words.,1 If you _ (want) to listen to music, _ (choose) a CD. 2 If you _ (buy) a new camera, _ (get) a good one. 3 If the light _ (not come) on, _ (wait) for one minute.,want,choose,buy,get,doesnt come,wait,4 If you _ (want) to keep the picture, _ (save) it on your computer. 5 If it _ (not work), _ (wait) a minute and then _ (try) again. 6 If you _ (need) to send an email, _ (use) my computer.,doesnt wor