高中英语外研版(2019)必修第二册-Unit2Let'scelebrate!-Usinglanguage-教案

1、Unit 2 Lets celebrateUsing language【教学目标】.掌握本课的重要词汇与句式；.使学生能够了解并掌握情态动词表示推测的基本用法，增强使用情态动词的意识，学会在真实语境中正确运用情态动词。【教学重难点】使学生能够了解并掌握情态动词表示推测的基本用法，增强使用情态动词的意识，学会在真实语境中正确运用情态动词。【教学过程】Step 1课前自学一、知识梳理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、主要用法精讲本单元所学的情态动词表示推测的具体用法如下，教师可根据学生的学情安排教学。情态动词+动词原形can+动词原形A. 用于肯定句，表示客观可能性，意为“可能”，

6、即从理论上看是可能的，但不一定会发生。例如：As a human being, anyone can make a mistake1仅为人类，任何人者B有可能犯错。 )B.用于否定句或疑问旬，表示对现在的动作或状态进行主观的猜测，意为“可能”，或表示惊异、怀疑等态度。例如：He can t have a lot of moneyFT能有很多钱。)Can it be that it was I, not he, who was mistaken? 难道是我弄错了，而不是他弄错了？may动词原形，表示主观的推测，意为“或许”用于肯定句和否定句均可。例如He may be very busy now

7、. 他现在可能很忙。()He may not be at home的可能不在家。）注意：表示可能性时，can语气较强，表示“不可能；may not语气较弱；表示“可能不，或许不”。might+动词原形，表示推测，意为“可能”,可以指过去的情况，也可以指现在的情况，但语气比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（他们现在可能有很多活儿要干，不过我不确定。She was afraid they might not like the idea. TOC o 1-5 h z （她

8、担心他们可能不喜欢这个想法。）could+动词原形，意为“可能”,可以指过去的情况，也可以指现在的情况，语气缓和。多用于否定句或疑问句。例如He looks young. He couldn t beoVeh50很年轻，不可能超过 50 岁。）Could it be true? （那可能是真的吗？）5）must+动词原形，表示猜测，意为“准是，一定”，通常用于肯定何。例如：This must be your room.（这一定是你的房间。）Look at his new car. He must have a lot of money.瞧他那辆新车。他肯定很有钱。）2. 情态动词+完成式mus

9、t+完成式，表示对已发生情况的推测，通常用于肯定何。例如：She must have gone home.她肯定已经回家了。）can位成式，表示对已发生情况的推测，主要用于否定句或疑问旬。例如：You can t have forgotten herF（能已经忘记她了。）Where can she have put it?她到底把它放在哪儿了呢？）could+完成式，表示对过去情况的推测，多用于否定句或疑问句。例如:He could not have been more than 16 at that time他当时不可能超过 16 岁。)Could she have forgotten my

10、 address?(会忘记我的地址吗？)may/might+完成式，表示对已发生事情的不肯定的推测，might相比may语气更加不肯定。例如：He may / might have come by train. 他可能是坐火车来的。()Step 2 语法探究. 表推测的情态动词用法小结：英语中有不少情态动词都可以表示推测，其语气有强有弱，表示的可能性有大有小，情态动词表推测时，可能性由弱到袭的排列顺序如下：mightfmayf could-car-shouldfwould-must。.情态动词(may/might, can/could, must等)无人称和数的变化：不能单独使用，必须与其后的

11、动词原形构成谓语。Step 3 自学检测补全句子。a. Sorry， I m late. I the alarm clock and gone back to sleep again.对不起，我迟到了。我可能已经关掉闹钟，又睡着了。b. Hi, Tom. Any idea where Jane is? 嗨，汤姆。知道简在哪里吗？She. I saw her there just now.她肯定在教室。我刚才在那儿看到她。 The woman biologist stayed in Africa studying wild animals for 13 years before sheretur

12、ned这位女生物学家在回国前在非洲研究野生动物长达13年。 Oh， dear! She a lot of difficulties! 哦，天哪！她一定经历了很多困难！ I ve taken someone else s green sweater !&*0人的绿色毛衣。It. He always wears green.能是哈利的。他总是穿绿色的衣服。e Do you know where David is ? I couldn t find him anywhere.口道大卫在哪里吗?我到处都找不到他。 He. His coat s still here可能走得太远。他的外套还在这里。1 根据本节语法（情态动词表猜测）：情态动词+ 动词原形/完成式，把句子补充完整；2根据所学，看看填入不同情态动词所表达的意思有何不同。Step