高中英語外研版(2019)必修第二冊-Unit2Let'scelebrate!-Usinglanguage-教案

1、Unit 2 Lets celebrateUsing language【教學(xué)目標】.掌握本課的重要詞匯與句式；.使學(xué)生能夠了解并掌握情態(tài)動詞表示推測的基本用法，增強使用情態(tài)動詞的意識，學(xué)會在真實語境中正確運用情態(tài)動詞。【教學(xué)重難點】使學(xué)生能夠了解并掌握情態(tài)動詞表示推測的基本用法，增強使用情態(tài)動詞的意識，學(xué)會在真實語境中正確運用情態(tài)動詞。【教學(xué)過程】Step 1課前自學(xué)一、知識梳理Activity 1Look at the sentences from the reading passage and answer the questions.a That is why Letters from

2、Father Christmascould be the perfect book.b The children must have been very excited as they opened it.c . they might not receive their presents if they were not good.What do the words in bold indicate: an order, a request, ability or possibility?(Answer: The words in bold indicate possibility.)Will

3、 the meaning of sentence (a) change if we replace “could withmustor“might” ？(Answer: If we replace “could ” with“must” , the meaning of sentence (a) will change.means the speaker is quite sure about the statement. If we replace“ could ” with “meaning of sentence (a) will remain more or less the same

4、. “ Could ”and “ might ”in affirmative sentences have a similar meaning when indicating possibility.)What happens if we change “ must”and “ might ”in sentences (b) and (c) into “ could ”?(Answer: If we change “ must” in sentence (b) into “ could ” , it means the speaker i sure about the statement, a

5、nd it s only a possibility. If we change“ might ” in sen“ could ” , it means it s impossible for the children to receive their presents.)Now get the Ss to look for more sentences with modals in the reading passage.二、主要用法精講本單元所學(xué)的情態(tài)動詞表示推測的具體用法如下，教師可根據(jù)學(xué)生的學(xué)情安排教學(xué)。情態(tài)動詞+動詞原形can+動詞原形A. 用于肯定句，表示客觀可能性，意為“可能”，

6、即從理論上看是可能的，但不一定會發(fā)生。例如：As a human being, anyone can make a mistake1僅為人類，任何人者B有可能犯錯。 )B.用于否定句或疑問旬，表示對現(xiàn)在的動作或狀態(tài)進行主觀的猜測，意為“可能”，或表示驚異、懷疑等態(tài)度。例如：He can t have a lot of moneyFT能有很多錢。)Can it be that it was I, not he, who was mistaken? 難道是我弄錯了，而不是他弄錯了？may動詞原形，表示主觀的推測，意為“或許”用于肯定句和否定句均可。例如He may be very busy now

7、. 他現(xiàn)在可能很忙。()He may not be at home的可能不在家。）注意：表示可能性時，can語氣較強，表示“不可能；may not語氣較弱；表示“可能不，或許不”。might+動詞原形，表示推測，意為“可能”,可以指過去的情況，也可以指現(xiàn)在的情況，但語氣比may 更加不肯定。用于肯定句或否定句均可。例如：They might have a lot of work to do now but I m not sure（他們現(xiàn)在可能有很多活兒要干，不過我不確定。She was afraid they might not like the idea. TOC o 1-5 h z （她

8、擔心他們可能不喜歡這個想法。）could+動詞原形，意為“可能”,可以指過去的情況，也可以指現(xiàn)在的情況，語氣緩和。多用于否定句或疑問句。例如He looks young. He couldn t beoVeh50很年輕，不可能超過 50 歲。）Could it be true? （那可能是真的嗎？）5）must+動詞原形，表示猜測，意為“準是，一定”，通常用于肯定何。例如：This must be your room.（這一定是你的房間。）Look at his new car. He must have a lot of money.瞧他那輛新車。他肯定很有錢。）2. 情態(tài)動詞+完成式mus

9、t+完成式，表示對已發(fā)生情況的推測，通常用于肯定何。例如：She must have gone home.她肯定已經(jīng)回家了。）can位成式，表示對已發(fā)生情況的推測，主要用于否定句或疑問旬。例如：You can t have forgotten herF（能已經(jīng)忘記她了。）Where can she have put it?她到底把它放在哪兒了呢？）could+完成式，表示對過去情況的推測，多用于否定句或疑問句。例如:He could not have been more than 16 at that time他當時不可能超過 16 歲。)Could she have forgotten my

10、 address?(會忘記我的地址嗎？)may/might+完成式，表示對已發(fā)生事情的不肯定的推測，might相比may語氣更加不肯定。例如：He may / might have come by train. 他可能是坐火車來的。()Step 2 語法探究. 表推測的情態(tài)動詞用法小結(jié)：英語中有不少情態(tài)動詞都可以表示推測，其語氣有強有弱，表示的可能性有大有小，情態(tài)動詞表推測時，可能性由弱到襲的排列順序如下：mightfmayf could-car-shouldfwould-must。.情態(tài)動詞(may/might, can/could, must等)無人稱和數(shù)的變化：不能單獨使用，必須與其后的

11、動詞原形構(gòu)成謂語。Step 3 自學(xué)檢測補全句子。a. Sorry， I m late. I the alarm clock and gone back to sleep again.對不起，我遲到了。我可能已經(jīng)關(guān)掉鬧鐘，又睡著了。b. Hi, Tom. Any idea where Jane is? 嗨，湯姆。知道簡在哪里嗎？She. I saw her there just now.她肯定在教室。我剛才在那兒看到她。 The woman biologist stayed in Africa studying wild animals for 13 years before sheretur

12、ned這位女生物學(xué)家在回國前在非洲研究野生動物長達13年。 Oh， dear! She a lot of difficulties! 哦，天哪！她一定經(jīng)歷了很多困難！ I ve taken someone else s green sweater !&*0人的綠色毛衣。It. He always wears green.能是哈利的。他總是穿綠色的衣服。e Do you know where David is ? I couldn t find him anywhere.口道大衛(wèi)在哪里嗎?我到處都找不到他。 He. His coat s still here可能走得太遠。他的外套還在這里。1 根據(jù)本節(jié)語法（情態(tài)動詞表猜測）：情態(tài)動詞+ 動詞原形/完成式，把句子補充完整；2根據(jù)所學(xué)，看看填入不同情態(tài)動詞所表達的意思有何不同。Step