2019-2020年外研版高中英語選修8 Module 6《The Tang Poems》(Grammar)教案.doc
2019-2020年外研版高中英語選修8 Module 6The Tang Poems(Grammar)教案教 學(xué)目 標Get Ss to master the function of modal verbs 重 點Use of modal verbs must ,cant, may/might, should, could, would教 學(xué)過 程Step1. Lead in through some exercises of modalsRead the sentences and tell the similarities of them.Step2. 情態(tài)動詞表推測的用法:l Must表示推測時的用法1、must 表示推測“可能性”時,意思是“一定、準是”,語氣肯定,有把握。 He must be American.= It is certain that he is American. 他準是個美國人。 John must go to Shanghai with his father.約翰一定是跟父親一起去上海了。 2、must表推測只能用于肯定句,而表示“一定不”時,要用cant; 詢問可能性時,用can。對比: He must know my telephone number. 他一定知道我的電話號碼。 He cant know my address. 他一定不知道我的電話號碼。 Can he know my telephone number? 他有可能知道我的電話號碼嗎?3. must表推測的句型 must動詞原型 表示對現(xiàn)在情況的推測 must bev-ing形式表示對正在發(fā)生情況的推測 musthave過去分詞表示對過去情況的推測注:must表示推測時很少用于將來的情況。一般不用He must come tomorrow.可用Its certain / Im sure that he will come tomorrow4、在含有must的反意疑問句中,疑問部分的助動詞根據(jù)實際情況而定: He must be an actor, isnt he?(表現(xiàn)在 )他一定是個演員,對嗎? She must have met a fairy, hasnt she? (表完成)她一定遇到仙女了,是嗎? It must have rained last night, didnt it? (表過去)昨晚一定下雨了,是不是?l Can/cant表示推測時的用法1、can表示推測“可能性”時,往往用于否定句或疑問句;Cant “一定不”,語氣很肯定。can在疑問句中意思是“會、可能” 。 He cant go to school today. = It is impossible that he doesnt go to school. 他一定沒去上學(xué)。 Can the news be true? 這消息可能是真的嗎?2、can /cant 表推測時的句型 can/cant 動詞原型 表示對現(xiàn)在情況的推測 can /cant bev-ing形式 表示對正在發(fā)生情況的推測 can/cant have過去分詞 表示對過去情況的推測3、在含有cant 的反意疑問句中,疑問部分的助動詞根據(jù)實際情況而定: He cant be a teacher, is he? 他不是教師,是嗎? She cant have finished her homework, has she? 她一定沒有完成家庭作業(yè),是不是? John cant have gone swimming yesterday, did he? 昨天約翰一定沒去游泳,對嗎?l May和might的用法1. may, might 表示推測“可能性”時,意思是“可能”、“也許”, 語氣上不是太肯定。 He may / might be in his office now. = It is possible that he is in his office. 他現(xiàn)在可能在辦公室。 注:might不表示過去時態(tài),只是語氣上比may更委婉,表示的可能性更小。2、may, might表推測時,可以用于否定句,意思是“可能不、也許不”,但不用于疑問句。 He may / might not come back forever. 他也許永遠不回來了。 It may/ might not snow tonight. 今天晚上可能不會下雪。3、may/ might表推測時的句型: may/ might動詞原型 表示對現(xiàn)在情況的推測 may/ mightbev-ing形式 表示對正在發(fā)生的情況的推測 may/ mighthave過去分詞 表示對過去情況的推測Step3. 情態(tài)動詞could, should, would的用法u Could的用法1、could 表示推測,表示某事有可能發(fā)生或可能是事實。在肯定句中沒有must那么有把握;在否定句中沒有cant那么有把握。 2、could 還可以用于表示客氣、委婉、禮貌的請求語氣。 Excuse me, could you tell me the way to the bus station?u Should 的用法1. should 可以用來表示假設(shè)、意愿、可能性、義務(wù)、委托、建議、命令、目的等。 I should advise you to say less and do more. 我想勸你少說多做。(表意愿) She is considering how she should answer. 她正在考慮應(yīng)該如何作答。(表義務(wù)) The boys shouldnt be playing football at this time. They should be at school. 孩子們這個時候不該在踢足球,他們應(yīng)該在學(xué)校上學(xué)。(表可能性)2、should(not)have過去分詞 表示“本(不)應(yīng)該 ”,常含有后悔、責備之意。 We should have checked the time before we left. 我們本應(yīng)該先核對一下時間再動身的。 You shouldnt have lent him money three years ago. 你本不應(yīng)該在三年前借錢給他的u Would 的用法Would是will的過去式,表示意志、習(xí)慣性、推測、設(shè)想、請求、愿望、疑惑等。 She would not go to the dentist even though she was in considerable pain.(意愿) When my parents were away, my grand mother would look after me. (習(xí)慣性) The person you mentioned would be her son. (推測) u Would/should/could 用于虛擬語氣的用法would/should/could 用于虛擬語氣, 表示與現(xiàn)在、將來或過去事實相反的假設(shè)。 If I were you , I should/could/would quarrel with the headmaster. (與現(xiàn)在事實相反) If time permitted tomorrow, I should/would/ could drive you to the station. (與將來事實相反) If I had seen him last night, I should/would/ could have gone with him. (與過去事實相反)Step4. 語法練習(xí)(見練習(xí)部分)