课题 B3Unit 2Grammar学习目标Enable the Ss to use modal verb. 合 作互动学生活动教学设计学习重点Learn some words ,such as modal verb + have done互动与展示 .must have donecan/could have donemay/might have doneneedn’t have doneshouldn’t have doneNew contents: Ss have a discussion about the two parts.After finishing the discussion, ask students to show their points on the blackboard. 学习难点Enable the Ss how to use them.自主研讨学生活动教学设计目标与导入Learning aim: 1. To Learn the modal verb2. Enable the Ss how to use themLead-in情态动词＋have done 结构的用法.Aim showing Lead-in自学与诊断..情态动词＋have done 结构的用法(1)must＋have done 表示对过去发生事情所作出的合理或确有把握的推测，“想必/准是/一定……”，只用于肯定句中，在否定句或疑问句中通常被 can/can’t＋have done 代替。From what you said, she must have told you all about it.从你所说的来看，她一定把一切都告诉你了。(2)should (ought to) have done 表示“过去本应该做某事而(实际上)没有做”，含有责备或遗憾的语气；其否定形式表示某种行为不该发生却发生了。You should have done more exercise before.以前你应该多进行锻炼的。You shouldn’t have let anyone else know the secret.你本不应该让其他任何人知道这个秘密的。Homework comments and Revision:Ask the students to review the Passive Voice精 讲 与点拨(2)can have done 一般用于疑问句和否定句中，用于表示对过去所发生事情的推测。could have done 用于肯定句时，表示“可能已经做过某事”或“本有能力做某事而未做”。Mr. Smith can’t have gone to Beijing, for I saw him in the library just now.史密斯先生不可能去北京了，我刚才还在图书馆看见他了。You made a mistake again; you could have been more careful.你又犯错了，你本能更仔细些的。 (2012·北京高考)We________ the difficulty together, but why didn’t you tell me?A．should face B．might faceC．could have faced D．must have faced. The teacher properly gives instru...
