Lesson 100 教学设计方案Teaching AimsTeaching proceduresStep 1 Revisionl .Check the homework exercises.2. Revise the contents of the story in Lessons 98 and 99.Step 2 ListeningListening Cassette Unit 25. Play the tape for Ex. 1 two or three times as necessary. Then do Exx. 2 and 3. Pause the tape at important moments and help the Ss to find the answers when they need help.Step 3 PracticeListening Unit 25, Ex. 4. The Ss tell the story to their partners.Step 4 PresentationWrite this on the Bb:CERTAIN POSSIBLE IMPOSSIBLE1 He must might / may / could can't be American.2 They might not / may not be very happy.For sentence 1, if possible, show some pictures of men to the Ss and ask them to guess whether they are American or not, using these phrases. Point out the categories: Certain and Impossible. Tell the Ss that when we are sure about something we can use must be or can't be. Point out that it is a mistake to say mustn't when we are talking about something which we think is impossible. Tell the Ss that might, may and could are used when we are not very sure about our guess.For sentence 2, tell the Ss that we say might not/may not when we are not very sure about our guess, but that could not is incorrect.Step 5 PracticeSB Lesson 100, Part 2. Go through the instructions and do Number I orally with the class. Then get the Ss to complete this exercise individually. Go over the answers with the class.Suggested answers:1. He must be in his office.2 .He may / might / could be at the conference.3 .They must have / earn a lot of money.4 .They must be foreign.5 .He must walk too fast.6 .They may / might not be at the station.7 .He can't be terribly busy.8 .She may / might /...
