Unit 3 Language in use,1. If you want to turn on the recorder , press the blue button. 2. If you like great music, please welcome Sally Maxwell. 3. If the red light doesnt come on, wait for thirty seconds. 4. If theres no green light, choose the “copy” symbol.,Language practice:,Grammar,If表示“如果”、“假如”引导条件状语从句。如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。如： We can walk there if we cant find a bus . If it rains tomorrow ,we will not go to the zoo. What will you do if you find a panda in danger. 条件状语从句和主句还有一个共同的伙伴，有时它可以替代从句和主句，它就是“祈使句+and / or+简单句”。其中and表示句意顺承；or则表示转折，意为“否则”。例如：,If you work harder, youll pass the exam. = Work harder, and youll pass the exam. 如果你再努力些，你就会通过考试。 If you dont hurry up, youll miss the train. = Hurry up, or youll miss the train. 如果你不快点儿，你就赶不上火车了。 在学习条件状语从句时，同学们要注意以下几点： 1. 时态呼应 一般来讲，复合句都要遵循主、从句时态呼应规律，状语从句也不例外。即主句用现在时，从句也用现在时；主句用过去时，从句也用过去的某种时态。具体地讲，主句是一般现在时(包括祈使句和含有情态动词can, may, must等)， 从句也用一般现在时。,例如：Have a good rest if you are tired. 如果你累了，就好好休息一会儿吧。 You must see the doctor if you are ill. 如果你生病了，就必须去看医生。 特别要注意：如果主句是一般将来时态，这时从句不可以用将来时态，而要用一般现在时。 例如： I wont go there with you if it rains tomorrow. 如果明天下雨的话，我就不和你一起去那儿了。 If we do nothing, there will be only standing room on the earth. 假如我们不采取任何措施，地球上将只有站 的地方了。,2. 主从句的位置 大多数情况下，从句可以位于主句之前，也可以位于主句之后。不过从句在前时，主从句之间必须用逗号隔开。例如： Please tell me if he comes back. = If he comes back, please tell me. 如果他回来了，请告诉我一声。,Complete the sentences with the correct form of the words in Activity 1.,1. If you _ (want) to know how it works, _ (read) the instructions. 2. If you _ (want) to listen to music, _ (choose) a CD. 3. If you _ (buy) a new camera, _ (get) a good one. 4. If the light _ (not, come) on, _ (wait) for one minute. 5. If you _ (want) to keep the picture, _ (save) it on your computer.,want read,want choose,buy get,doesnt come wait,want save,6. If it _(not, work) , _ (wait) a minute and then _ (try) again. 7. If you _ (need) to send an email, _ (use) my computer. 8. If you _ (not, know) how to use the camera, _ (read) the instructions. 9. If you _ (not, like) the programme , _ (turn) the TV off .,doesnt work wait try,need use,dont know read,dont like turn,Write instructions,record/press/red key_. 2. send/a text message/use/mobile phone_. 3. like/the pictures/save/on the computer_.,If you want to record, press the red key,If you want to send a text message, use the mobile phone,If you like the pictures, save them on the computer,4. find out/ how it works/ read/ instructions_. 5. see/ photos/ look on/ website_.,If you want to find out how it works, read the instructions,If you want to see photos, look on the website,Work in Pairs,Ask and answer. What do you do if . e.g. : want to turn on the recorder? press the blue button What do you do if you want to turn on the recorder? I press the blue button.,1. want to record? press the red button 2. want to keep the photos? save / on the computer 3. want to send text messages? use a mobile phone 4. want to find out how to use the camera? read the instructions 5. want to watch the news? turn on the TV,1. What do you do if you want to record?I press the red button. 2. What do you do if you want to keep the photos?I save them on the computer. 3. What do you do if you want to send text messages?I use a mobile phone. 4. What do you do if you want to find out how to use the camera?I read the instructions. 5. What do you do if you want to watch the news?I turn on the TV.,Answers:,Complete the passage with the correct form of the words and expressions in the box. button; choose; copy; connect; instruction; light; play back; memory; symbol; turn on Getting to Know Your Cd Recorder Follow these (1)_ for the best results. First, press the blue (2)_ to (3)_ the recorder. When youre ready to record,instructions,button,turn on,press the red button. The (4)_ comes on to show you that its recording. If you want to (5)_, press the green button. The recorder has only a small (6)_. To (7)_ your recording, (8)_ the recorder to your computer. (9)_ the “copy“ (10)_ and save the recording on the computer.,light,play back,memory,copy,connect,Choose,symbol,Listen and check the true sentences.,1. The prices of the mobile phones are different. 2. All mobile phones can send text messages. 3. The woman only wants to make calls. 4. The woman isnt interested in a camera phone. 5. The man shows the woman a phone that can save music. 6. The woman knows which mobile phone she wants.,T,T,F,F,T,F,Read the advertisement in Activity 6 and answer the questions. 1. How can you send a postcard from your mobile phone? 2. What will Mobycard do with your photo?,