外研版八年级上Module 12 Unit 3.ppt

Unit 3 Language in use,Module 12 Help,Objectives,To summarise and consolidate the use of modal verbs must, can, could (for prediction) To learn the imperative for suggestions and instructions,I dont know when theyll be here. They could arrive at any time. 我不知道他们多会来，他们可能随时会来。 This new drug could be an important step in the fight against cancer. 这种新药可能是攻克癌症过程中迈出的重要一步。,The phone is ringing. It could be Nick.,Read the sentences and conversations and pay attention to the circled parts. What do they mean?,Who sent the present? Can it be your brother?,It must be your brother. I saw him in your room just now.,It cant be my brother. He is still in France.,1. That could be harmful! 2. Betty, you must know! 3. But he could have trouble hearing you or speaking to you. 4. You could drop him and hurt him even more.,Observe the following sentences carefully and pay attention to the words in red.,Observe,情态动词must, can, could表推测,注意：用于疑问句时，can比could 表示的“可能性”要大。,情态动词 must/can/could 表示推测,之前我们学过情态动词 can和could 表“能够，可以”等意义的用法。 另外，can和could 还可表示对现在或将来的推测，意为 “会, 可能”。,1. He could be in pain. 他可能很疼。 2. That could be harmful! 那可能有害！ 3. Can/Could this be true? 这有可能是真的吗?,情态动词 must 表示有把握的猜测，意为“一定，准是”，通常只用于肯定句。如： Betty, you must know! 贝蒂，你肯定知道！,请仔细对比下列一组句子： Who sent the present? Can it be your brother? 是谁送来的礼物啊？会是你哥哥吗？ （询问可能性） It must be your brother. I saw him in your room just now. 肯定是你哥哥，我刚才看见他在你的房间里。 （语气强烈，表示非常肯定） It cant be my brother. He is still in France. 不可能是我哥哥，他还在法国呢。 （表示不可能）,祈使句,1. Hide under a table. Stay away from windows and heavy furniture. Keep Clear of fires. 2. Leave the buildings quickly 3. Keep calm, Be brave and be helpful. 4. Move away from buildings, 5. Stay away from bridges and trees. 6. In the mountains, be careful of falling rocks. 7. On a beach, run away from the sea and move quickly to higher ground.,What shall we do or not do if an earthquake happens?,Revision,1. Dont jump out of high buildings. 2. Dont stand near street lights or under power lines.,1. Stay away from windows and heavy furniture. 2. Do not stand near street lights or under power lines. 3. Make sure hes warm. Cover him with a coat. 4. Find out whats wrong with him. 5. Do not jump out of high buildings. 6. On a beach, run away from the sea and move quickly to higher ground.,Observe,Observe the following sentences carefully and pay attention to the words in red.,1. _ _ _ (stay) windows and heavy furniture. 2. _ _ (stand) near street lights or under power lines. 3. _ _ (make sure) hes warm. _ him with a coat. 4. _ _ (find) whats wrong with him. 5. _ _ _ _ _ (not jump) high buildings. 6. On a beach, _ _ _ (run) the sea and _ (move) quickly to higher ground.,Make sure,Find out,Do not jump out of,run away from,move,Cover,Stay away from,Dont stand,go,Ready?,祈使句,祈使句表达说话人对对方的叮嘱、劝告、希望、禁止、建议、请求或命令等。 *一般以动词原形开头，无时态和数的变化。 *常见的祈使句如下： 1. 动词原形构成的祈使句 2. lets构成的祈使句 3. 无动词祈使句,1. 动词原形或Be单词构成的祈使句 此类祈使句暗含的主语是you，但通常省略。 否定句往往由 do not (dont)或never开头。,Have a nice day! 祝你度过美好的一天！ Dont waste your time! 别浪费时间了！ Never be late again! 再也不要迟到了！,Come this way, please. 请走这边。 Please be quiet, boys! 男孩们，请安静！,祈使句的句首或句末有时加 please，还可以加上称呼语，用逗号与句子主体隔开。,2. lets构成的祈使句 这类祈使句往往用于提出建议。 Lets spend this weekend in the countryside. 这周咱们到乡下度周末吧。 Lets take a taxi, shall we? 我们坐出租车好吗？,lets/let us否定形式：,1.let us 前可加dont，也可以let us not Dont let us go with her tomorrow =Let us not go with her tomorrow. 2.Lets,必须在其后加not Lets not go with her tomorrow.,3. 无动词祈使句 在请求、命令和口号中，常用无动词祈使句，它实际上是省略了动词，从而使语句更简洁有力。 Just a minute, please! 请稍等！ This way, please! 请这边走！,4. 在公共场合的提示语中，否定句常用：NO+名词或动名词结构 NO photos ! NO smoking!,Summary ,can和could可以表示对现在或将来的推测。,“must be + 表语”表示对现在情况的推测，常用于肯定句，意为“一定，准是”。,常见的祈使句如下： 1. 动词原形构成的祈使句 2. lets构成的祈使句 3. 无动词祈使句,Summary ,注: word 文档 点击此处链接,Quiz,I. 用could/can/must或他们的适当形式填空。 Is that woman your head teacher? No, it _ be her. Our head teacher is in her office. 2. Whose schoolbag is this? It _ be Jennys. It has her name on it. 3. Listen! Someone is knocking at the door. Who _ it be?,cant,could,must,II. 按要求完成句子。 1. You must be careful with your handwriting. (改为祈使句) _ _ with your handwriting. 2. Talk and read loudly in class. (改为否定句) _ _ and read loudly in class. 3. The girl singing in the next room must be Lucy. (改为否定句) The girl singing in the next room _ _ Lucy.,Be careful,Dont talk,cant,be,III. 根据提示，用祈使句型写出句子。 1. 请举起你的右手。 2. 不要在课堂上大声说话。 3. 咱们一起上学去吧。 4. 请来两块面包。 5. 再不要这样做了。,Never do that again.,Please put up your right hand.,Dont talk loudly in class.,Lets go to school together.,Two pieces of bread, please.,IV. 根据语境选用could, must或cant填空。 1. Theres a bag on the desk. Whose _ it be? 2. I think the book _ be Mikes because his name is on it. 3. Is that your sister? It _ be her. She went to Shenyang this morning.,could,cant,must,V. 根据括号内所给英文提示语将下列句子翻译成英语。 1. 晚上不要独自外出。 (dont) Dont go out alone at night. 2. 在课堂上请听老师的。 (listen to) Listen to the teacher in class, please. / Please listen to the teacher in class.,3. 禁止拍照！ (no) No photos! 4. 咱们去公园吧。 (let) Lets go to the park.,VI. 根据语境选择恰当的短语填空。 1. I _ how to cook last week. 2. Lots of people are _ the train at the train station. 3. Look! A woman is _ help in the middle of the lake!,wait for because of call for be proud of learn about,learnt about,waiting for,calling for,4. We had t