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课件网) Unit 3 Language in use To summarise and consolidate the use of modal verbs — must, can, could (for prediction) To learn the imperative for suggestions and instructions ●The phone is ringing. It could be Nick. 电话响了，可能是尼克打来的。 ●I don’t know when they’ll 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。 Read the conversations and pay attention to the circled parts. 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 Observe the following sentences carefully and pay attention to the words in red. 1. That _____ be harmful! 2. Betty, you _____ know! 3. But he _____ have trouble hearing you or speaking to you. 4. You _____ drop him and hurt him even more. could must could go could Ready? 情态动词must,can, could表推测 情态动词?must/can/could?表示推测 我们学习过情态动词 can 和 could 表示“能够，可以”等意义的用法。can 和 could 还可以表示对现在或将来的推测，意为“会, 可能”，但 can 表示推测时，往往用于否定句和疑问句。用于疑问句时，can 比 could 表示的“可能性”要大；用于否定句时，cannot (can’t)表示“不可能”。例如： He can’t be at home.? 他不可能在家。 could 则可用于肯定句、否定句和疑问句。在以下例句中，can 和 could 均表示可能： He could be in pain.? 他可能很疼。 That could be harmful!? 那可能有害！ Can/Could this be true?? 这有可能是真的吗? 情态动词 must 也可以表示猜测，意思为“一定，准是”，通常只用于肯定句。如课文中的例子： 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 can’t 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. Don’t jump out of high buildings. 2. Don’t 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 he’s warm. Cover him with a coat. 4. Find out what’s 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 ... ...
