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111Module 6 Unexplained Mysteries of the Natural WorldPeriod 4 Function, GrammarTeaching Goals: 1. To enable Ss to know about the way to express possibility and improbability.2. To enable Ss to master the usage of “may”, “might”, and “likely”.3. To help Ss learn how to use modal verbs “may” and “might” to express conjecture.Teaching procedures:Step 1. Revision Check the answers to the Vocabulary exercises in the Workbook.Step 2. FunctionPurpose: To let Ss know how to talk about possibility and improbability.1. Pair workAsk Ss to do Activity 1 on page 54 and then call back the answers.Suggested Answers:(1) a, b(2) c (3) unlikely2. Group workAsk Ss to identify the creatures in the pictures in Activity 4 on page 55, by using “may” or “might”. Arouse their interest in talking about possibility.3. Individual workAsk Ss to do Activity 2 on page 54 individually. Then check their answers.Suggested Answers:(1) There might still be dinosaurs somewhere.(2) Dont go near the water. It may be very deep.(3) We are unlikely to see the monster.(4) There may be an underground river from Loch Ness to the sea.(5) We must help him he may not be able to swim.(6) There are likely to be lots of strange creatures in that lake.Step 3. Grammar Purpose: To enable Ss to know how to use modal verbs “may” and “might” to express conjecture.1.Group workAsk Ss to discuss the two sentences in Activity 1 of Grammar on page 57, and then ask them to choose the best answer.Suggested Answers: We use may have or might have (with the past participle) to talk about something which happened in the pastperhaps. 2. Explanation Explain how to use modal verbs to talk about something which happened in the pastperhaps.(1) 对过去的事情进行猜测，但把握较小时，肯定形式一般用may have done，否定形式一般用may not have done。如：He may have gone back home, because he didnt say he would take part in her birthday party.He may not have paid for the bill, because he had lost his job.(2) 对过去的事情进行猜测，但把握更小时，肯定形式一般用might have done，否定形式用might not have done。如：They helped send her bat to the hospital; otherwise, she thought, the baby might have died.She might not have left home when I got to school. (3) 对过去的事情进行猜测，并且可能性较大时，肯定形式一般用must have done，否定形式一般用cant have done。如：Your score is the highest; you must have studied very hard.You cant have seen her in her office last Friday; shes been out of town for two weeks.3. PracticeAsk Ss to do Activity 2 on page 57. Then call back the answers and correct them.Suggested Answers:(1) might have caused(2) may have cut off(3) may have survived(4) might have been killed4. Supplements Explain how to use modal verbs to talk about something which happened at presentperhaps.用来表猜测的情态动词有：must, can, may等，但它们所表示可能性是不同的。(1) 对现在的事情进行猜测，并且可能性较大时，肯定形式一般用must加动词原形，此时，must不再表示“必须”，而是表示“肯定”；否定形式一般用cant加动词原形，此时，can不再表示“能够”，而是表示“肯定不”。如：I saw him go out just now. He cant be in his own room. It must be Linda in the classroom, because she is on duty today. (2) 对现在的事情进行猜测，但把握较小时，肯定形式一般用may加动词原形，此时，may不再表示“可以”，而是表示“可能”；否定形式一般用may not加动词原形。如：He may tell the truth to his father.She may not angry because she is good-tempered.(3) 对现在的事情进行猜测，但把握更小时，肯定形式一般用might加动词原形；否定形式一般用might not加动词原形。如：She might not be angry because she usually is very patient.He might be at home now, but Im not sure.(4) 情态动词+动词现在进行时，表示对现在或将来正在进行的情况进行推测。如：At this moment, our teacher must be correcting our exam papers. Doctor Wang isnt here. He might be giving a lecture in the hall.(5) 情态动词+动词的现在完成进行时，表示对过去正在发生事情的推测。如：Your mother must have been looking for you. The light was on the whole night. He may have been doing his homework all the time.5. Consolidation Ask Ss to translate the following sentences. (1) 他们也许错过了那班飞机。 (2) 快点！他们正在机场等我们。(3) Tom是个诚实的孩子。他今晚可能会把真相告诉他父亲。 (4) 他五年前来看过我，他也许不费劲就能找到我的住处。Suggested Answers:(1) They may have missed the plane. (2) Lets hurry! They may be waiting for us at the airport.(3) Tom is an honest boy. He may tell his father about the truth this evening.(4) He came to see me five years ago. He might find my house without any difficulty.Step 4. Homework 1. Ask Ss to review Grammar.2. Ask Ss to finish Grammar exercises in the Workbook pages 9798. 111
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