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Unit 3,Language in use,1. No shouting, please! 2. Dont cross that rope! 3. Dont be rude! 4. If you ever go to London, make sure you visit the Science Museum.,Language practice,Look at the following sentences.,1. No shouting, please! 请勿喧哗! Dont cross that crop! 不要越过那条绳子！ No photos. 请勿拍照。 表示“禁止做某事”的结构，它的主要构成形式有： 1) No + 动名词 e.g. No smoking. 禁止吸烟。,Language notes,No shouting. 请勿喧哗。 No joking! 不要开玩笑！ 2) No + 名词 e.g. No photos. 请勿拍照。 No entry. 请勿入内。 3) 祈使句 祈使句同样可以用来表示“禁止做某 事”。 e.g. Dont make any noise. 不要吵闹。 Keep off the grass. 请勿践踏草坪。,1. Match the signs with the rules.,1. No swimming. 2. No football. 3. No right turn. 4. No parking. 5. No littering. 6. No food and drinks.,2. Look at the signs and write the rules.,_,_,_,_,Dont touch.,No smoking.,No photos.,No entry.,Look at the signs and write the rules.,Dont touch.,No photos.,No smoking.,No entry.,What does each sign mean? Write the rules.,Dont drink the water.,No parking.,No fire.,No food and drinks.,Grammar,if引导的状语从句。if引导的状语从句不是指已经发生的事件，而是指能够发生或可能发生的事件。 if从句+祈使句，相当于汉语的“如果，就”。 1. if从句的构成，例句： If you want to go, please tell me. 如果你想去的话，请告诉我一声。,状语从句,If you want to know more about it, call now. 如果你想了解更多内容，现在就打电话吧。 If you want to know what to see, look at the guide. 如果你想知道可参观的内容，就读一下指南吧。 if后面通常接一个完整的句子作从句。,2. if从句的位置 if引导的从句可以放在主句之前，也 可以放在主句之后。例如： If you ever go to London, make sure you visit the Science Museum. 如果你去伦敦，一定要去参观科学博物馆。可以改写为： Make sure you visit the Science Museum if you ever go to London.,3. if从句的用法 本模块主要学习并运用“if从句+祈使句”这种结构来表达建议。比如说，如果对方生病了，你建议他去看医生，就可以说： If you do not feel well, please go to see the doctor. 你如果感觉不舒服，就去看医生吧。,“禁止做某事”的句型总结,（1）No + v.-ing! No talking! （2）否定祈使句。 Dont jump. （3）情态动词must表示“禁止”。 You mustnt play with fire. （4）cant表示“不允许”。 You cant make any noise. （5）You arent allowed to 表示“不允许对方做某事”。 You arent allowed to watch TV at home before you finish your homework.,祈使句用来表达叮嘱、劝告、希望、禁止、警告、请求或命令等。祈使句最常用来表达命令。,Go and wash your hands. 快去洗手。 （命令） Be quiet, please. 请安静。 （请求）,祈使句,Be kind to our sister. 要对我们的妹妹友善。 （劝告） Watch your steps. 走路小心。 （警告） No littering. 不要乱扔垃圾。 （禁止） Dont forget to take an umbrella. 不要忘了带雨伞。 （叮嘱）,祈使句的特点：,(1) 祈使句一般没有主语，说话的对象都是第二人称“你”或“你们”，所以也可以理解为省略了主语you。祈使句末用句号或惊叹号，句子读时用降调。 (2) 以动词原形开头，无时态和数的变化。 (3) 祈使句的否定形式是在动词原形前加dont。,Please close the door. 请把门关上。 Sit down, please. 请坐。,(4) 在表达请求时，可以加上please; 表达比较强烈的语气时，可以用感叹号。,Dont worry. Be happy. 不要担心，高兴点儿。 Dont bring any food or drink into the lab next time. 下次不要把任何食物或饮料带到实验室来。 Dont forget to turn off the lights. 不要忘记关灯。,口 诀 下面的口诀总结了祈使句的一般规律。一起来看看吧! 祈使句, 有特点, 动词原形摆在前, 否定句式也不难, Dont 放在最前面, 其它一律都不变。,3. Complete the sentences with the correct form of the words in brackets.,If you _ (want) to see old machines, _ (go) to the museum. 2. If you _ (visit) London, _ (take) a boat trip on the river. 3. If the computer does not _ (start) immediately, _ (wait) for one minute.,want,wait,go,take,visit,start,4. If the weather _ (get) colder, _ (put) on more warm clothes. 5. If any student _ (have) a high fever, _ (send) him / her to the school doctor at once. 6. If you _ (want) to know how it works, _ (read) the book.,put,send,read,gets,has,want,4. Complete the sentences with your own ideas.,1. If you do not like the TV programme, _.,If you want to join our team, practise more after class.,If you do not like the TV programme, _.,turn off the TV / change the channel,Complete the sentences.,read a book instead,2. If you want to know where you are, _.,ask the police for help,Complete the sentences.,3. If you cannot arrive at the station on time, _.,wait for the next train,Complete the sentences.,4. If you need to send an email, _.,turn on the computer,Complete the sentences.,5. If you want to go, please _.,Complete the sentences.,call,6. If you want to go skating, _.,Complete the sentences.,wear warm clothes,7. If you visit a museum, _.,Complete the sentences.,not shout, not run,6. Complete the sentences with the words or expression in the box.,at, between, inside, into, next to, on,1. The Science and Technology Room is _ the third floor. 2. Take the lift to the third floor. It is over there, _ the stairs. 3. There is a garden _ the back of the building.,on,next to,at,4. You are not allowed to go _ the museum without paying. 5. The shop is _ the ticket office and the main door. 6. There must be another way _ the room.,inside,between,into,7. Complete the passage with the expressions in the box.,as well, as well as, comparewith, looking forward to, make sure, pay attention to,Well, here we are at the Science Museum. Today we will be looking at ancient and modern technology. You can learn about history (1) _ technology.,as well as,Thats because changes in technology have changed the world. Please (2) _ the machines or tools invented in ancient China. They are very important in history and have changed the world forever. When you write your reports later, (3) _ that you (4) _ ancient technology _ modern technology.,pay attention to,make sure,compare,with,You might include some information about life in ancient and modern times (5) _. Im (6) _ reading the reports of your visit.,as well,looking forward to,homework,
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