北師大版高中英語必修5 Unit13 Lesson 3教案.doc

lesson 3 making guessing about peopleteaching aims:to practise using modals for speculationto distinguish between modals used for decision, advice and speculationteaching difficulties:to practise using modals for speculationteaching aids: computer, cassetteteaching procedures:. warming up t: first look at the title “making guessing about people” who can tell me whats the meaning of the title?s: t: “making guessing about people” means make a judge about people without being sure of all the facts. in daily life if we are curious or worried at somebody or something we often make various guess. think over which words we will use when we guess what will happen? what happened?s: must, may, may not, can, cant and so on. t: now we will listen to a dialogue in which there are a lot of words about speculation.listeninglisten to the dialogue to do the exercise1. the two students were missing _.a. perhaps because they were separated from the other students.b. in a cave.c. for the reason we dont know. 2. the dialogue tells us _.a. the two students disappeared 3 days ago.b. my cousin know where they arec. the rescuers found them in a cottage. 3. the dialogue makes various guessed except_.a. they must be frightened.b. they both are injured.c. they might have some food to eat.answers: 1.c 2.a 3.bt: can you say out the main idea of the story in you own words?s:t: now lets look at whether your story is true or not. do the exercise 2 listen to the dialogue again and complete the gapsplay the cassette once for students to listen and then again for them to complete the gaps. grammardo the exercise 3. the two people in the dialogue make various guesses at the two missing students.they use the following sentences but you need to complete the gaps with modal verbs. check students answers by having them read the sentences aloud. draw their attention to the different infinitive forms after the modals.do the exercise 4. as a class students discuss the meaning of the sentences in the table and decide if they express decision, advice or speculation.ask students how they would express decision (is going to; is about to;) and advice (should , had better, )do the exercise 5the grammar we learn today is modal verbs. modal verbs can express possibility, permission, intention and guess. now do the exercise 5. which of the modal verbs in exercise 3 express the following.do the exercise 6 as a whole class, students discuss what the sentences 1-3 are referring to and match them with a, b and c.guide students to analysis the modal verbs use in the past, in the future and now.用在肯定句中：對(duì)過去的推測(cè)：may /might have +pp(過去分詞)must have +pp(過去分詞)對(duì)現(xiàn)在的推測(cè)：must be + noun / adj.may be/ must be + v-ingmust +v(原形)用在否定句中對(duì)過去的推測(cè)：cant have + pp(過去分詞)對(duì)現(xiàn)在的推測(cè)：cant be + noun / adj.cant +v(原形)do the exercise 7, 8 and 9 to practise and consolidate modal verbsdo some best choice to consolidate modal verbs1. do you know where david is? i couldnt find him anywhere. -well. he _ have gone farhis coats still here.a. shouldnt b. mustnt c. cant d. wouldnt 2 -excuse me. is this the right way to the summer palace?-sorry, i am not sure. but it _ be.a. might b. willc. must d. can3. -tom graduated from college at a very young age. - oh, he _ have been a very smart boy then.a. could b. shouldc. might d. must4. -i heard they went skiing in the mountains last winter. - it _ true because there was little snow there. a. may not be b. wont be c. couldnt be d. mustnt be5. jack _ yet, otherwise he would have telephoned me. a. mustnt have arrived b. shouldnt have arrived c. cant have arrived d. neednt have arrived6. -didnt you know that you went driving at 100 kilometers an hour, madam?- _. my old car can do no more than 80, officer.a. i may not have been b. i couldnt have beenc. i mustnt have beend. i shouldnt have been answers: 1.c 2.a 3.d 4.c 5.c 6.c homeworkit is possible that some students cant master the use of modal verbs individually. so the teacher as