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课件网) New technology MP3 car plane computer mobile phone tape recorder rocket video camera fridge If you want to listen to music, choose_____. If you want to call others, choose_____. If you want to keep the food fresh, choose ____. If you want to take photos, choose _____. If you want to play games, choose _____. If you want to listen to the tapes, choose _____. an Mp3 a mobile phone a fridge a camera a computer a tape recorder 1. 相当于汉语的“如果……”的表达方式. 2. if 从句的构成 if 所引导的是一个完整的句子, 一定要有主语, 其中 “如果”后面的主句可以有主语, 也可以没有。如: 1) If I am free, I will go with you 如果我有空,我会跟你一起去. 2) If you want to go, please tell me. 如果你想去的话,请告诉我 3. If 从句的位置 if从句表示“如果……”,可以放在句子前面(如上面例句)也可以放在主句之后,如: Print the photo if you like it. 如果喜欢这图片就打印出来. 这些句子的结构都是：If从句＋祈使句 译成：如果… 被称为“条件状语从句” 例：If you like it, print the photo. Or: Print the photo if you like it. 练习－－主从句搭配 1.If you are tired, A eat something. 2.If you are hungry, B go to bed. 3.If you are bored, C go to see a doctor. 4.If your hands are dirty, D phone a friend. 5.If you are ill, E wash them. Join the sentences with if: -I can’t understand the sentence. - Use your dictionary. 2.-I want to improve my English. -Read English books. If you can’t understand the sentence, use your dictionary. If you want to improve your English, read English books. 3.-This is difficult. -Ask for help. 4.-The conversation is hard to understand. -Listen again. If the conversation is hard to understand，listen again. If this is difficult, ask for help. If you like it, If从句＋祈使句 表示“如果……” 这些句子称为带有“if”的条件状语从句。 1. If 从句的构成： If you want to turn on the recorder, press the blue button. If you want to record, press the red button. 2. If 从句的位置：if从句可以放在主句之前也可以放在主句之后。 从句 从句 主句 从句 主句 主句 print the photo. 例： Print the photo if you like it. 主句 从句 If he is very hungry, give him some food. Use ‘if’ to make sentences. food He is very hungry. You are very tired. If you are very tired, sit down and have a rest. He is ill. If he is ill, take him to see a doctor. You lose your money. If you lose your money, ask a policeman for help. 1.如果明天不下雨,我们就去公园. 2.如果你想看电视,请按一下这大按钮. 3.如果下星期我有时间的话,我去看你. If it doesn’t rain tomorrow, we’ll go to the park. If you want to watch TV, press the big button. If I am free next week, I’ll go to see you. Use the correct form of the words. If you _____ (want) to listen to music, _____ (choose) a CD. 2. If you _____ (buy) a new camera, _____ (ask) him to get a good one. 3. If the light _____ (not come) on, _____ ( wait) for one minute. 4. If we _____ (want) to keep the picture, _____ (save) it on our computer. 5. If they _____ (not know) how to use the camera, _____ (read) the instructio ... ...
