1、外研版（2019）英语 必修二01020304Discovering the rulesStudying the rulesApplying the rulesExercise01Look at the sentences from the reading passage and answer the questions.a That is why Letters from Father Christmas could be the perfect bookb The children must have been very excited as they opened it.c they m
2、ight not receive their presents if they were not good.01Discovering the rules1)What do the words in red indicate:an order,a request,ability or possibility?The words in red indicate possibility.v.表明,显示n.请求,要求a That is why Letters from Father Christmas could be the perfect bookb The children must have
3、 been very excited as they opened it.c they might not receive their presents if they were not good.01Discovering the rules2)Will the meaning of sentence(a)change if we replace“could”with“must”or“might”?If we replace“could”with“must”,the meaning of sentence(a)will change.It means the speaker is quite
4、 sure about the statement.If we replace“could”with“might”,the meaning of sentence(a)will remain more or less the same.“Could”and“might”in affirmative sentences have a similar meaning when indicating possibility.a That is why Letters from Father Christmas could be the perfect bookb The children must
5、have been very excited as they opened it.c they might not receive their presents if they were not good.01Discovering the rules3)What happens if we change“must”and“might”in sentences(b)and(c)into“could”?If we change“must”in sentence(b)into“could”,it means the speaker is not sure about the statement,a
6、nd its only a possibility.If we change“might”in sentence(c)into“could”,it means its impossible for the children to receive presents.a That is why Letters from Father Christmas could be the perfect bookb The children must have been very excited as they opened it.c they might not receive their present
7、s if they were not good.01Discovering the rulesLook for more sentences with modals in the reading passage.1)Who could it be from?2)The letters were also beautifully illustrated-each must have taken its true author,Tolkien,a long time to complete.3)In another letter,Father Christmas complained about
8、how he could not stop his helpers playing games with the toys instead of wrapping them up.4)we can all share the true spirit of giving at Christmas time.01Discovering the rules情态动词情态动词must,can/could,may/might均可表示推测均可表示推测,它们可它们可以对过去、现在或将来的情况作出语气强弱不同的推测。以对过去、现在或将来的情况作出语气强弱不同的推测。1.表示肯定的推测时：表示肯定的推测时：各情态
9、动词语气从弱到强依次为各情态动词语气从弱到强依次为 might may could can must；把握推测语气的特点，选择恰当的情态动词。把握推测语气的特点，选择恰当的情态动词。02Studying the rules表示否定的推测时：表示否定的推测时：cant/couldnt语气较强，意为语气较强，意为“不可能不可能”；may not/might not语气较弱，意为语气较弱，意为“可能不可能不”。must的否定形式的否定形式mustnt不表不表示否定推测，而是表示示否定推测，而是表示“不许不许可可”或或“不应该不应该”。02Studying the rules2.情态动词表示推测时情态
10、动词表示推测时,在用法上有一些限制在用法上有一些限制:must只用于肯定句中，意为只用于肯定句中，意为“一定，准是一定，准是”。如如:This must be your room.could多用于否定句和疑问句中。多用于否定句和疑问句中。如：如：He looks young.He couldnt be over 50.Could it be true?may/might用于肯定句和否定句中。用于肯定句和否定句中。如：如：They may not know his address.She told me that she might go to Hawaii this winter.02Stud
11、ying the rules确定被推测时间，正确判断动词时态。确定被推测时间，正确判断动词时态。1.对现在或将来的情况进行推测时，用“情态动词+do”。eg You must be Mr.Smith.I was told to expect you.Our team might win the race.02Studying the rules2.对此时此刻正在进行的情况进行推测时，用“情态动词+be+动词-ing形式”。eg She may be waiting for you in the entrance hall at the moment.The police are stoppin
12、g all cars.They must be looking for the escaped prisoner.02Studying the rules3.对过去的情况进行推测时，用对过去的情况进行推测时，用“情态动词情态动词+have done”。“情态动词情态动词+have done”是高考的热点，在做此是高考的热点，在做此类题时，要仔细体会题干中所提供的信息，尤其类题时，要仔细体会题干中所提供的信息，尤其注意题干中给出的时态。注意题干中给出的时态。eg I didnt see Alex.He might have gone home.I couldnt have left my bag
13、 on the bus.They must have gotten lost or theyd be here by now.02Studying the rulesmust have done一定，想必。表示对已经发生的事情的肯定推测，语气较强。eg It must have rained last night.The ground is wet.may/might have done可能已经，或许已经。表示对已经发生过的情况的肯定推测，语气稍弱。eg He may/might have given you more help,even though he was busy.02Studyi
14、ng the rulescould have done不可能。表示对过去发生的一不定推测。eg They cant have gone out,because the light is on.cant/couldnt have done表示过去本来能够做某事而实际上没有做eg He could have passed the exam,but he was too careless.02Studying the rules(At a fancy dress party)Chris:I spent ages putting up all the balloons and flowers last
15、 night.Jean:I expect you are feeling tired now!Chris:Yes,I am.Look that guy is dressed as Batman.Is that Mike?Jean:Its possibly him.Check out that girl over there.Im sure thats Lucy.Chris:No,I dont think thats Lucy.Lucy isnt that tall.Jean:Look at those two guys dressed as chickens!Oh,theyre waving
16、at us!Maybe theyre from our school.Chris:Lets go and find out.You must be tired now!It may/might/could be him.That must be Lucy!that cant be Lucy!They may/might/could be from our school.Rewrite the underlined sentences in the conversation using can/could,may/might and must.03Applying the rulesLook a
17、t the picture and make as many sentences as possible using can/could,may/might and must.03Applying the rulesThe woman in red must be very excited to buy so many things.The man with a wallet in his hand might be a bit reluctant to pay.The woman in glasses may be very tired to get up so early and carr
18、y so many bags.The cashier might be feeling uncomfortable as he is sweating a lot.03Applying the rules1.Since they arent answering their telephone,they _(can have left,must have left).2.Mr.Reed looks pale.He _(can,may)be ill.must have left mayI.选用括号内合适的内容补全下面句子。选用括号内合适的内容补全下面句子。04Exercise3.They _(mu
19、st,might)be holding a meeting in the classroom.Im not sure.4.You _(must,may)be Mr.Smith.I was told to pick you up.5.They _ live(could,must)in New York,but Im not sure.6.She was ill.She _(couldnt have attended,mustnt attend)the meeting here.mightmust couldcouldnt have attended04ExerciseDescribe a festival celebration using the words and expressions you have learnt.To celebrate,we often drink/eat,give as gift,decorate with04Exercise
