Unit5DiscoveringusefulStructures课件高中英语人教版必修第三册
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7. — Who was the man talking with your teacher?
— I’m not sure. It _m__ig_h__t be her brother.
8. I don’t know when the guests be here. Theyw_i_l_l _/_c_o_u_l_darrive at any time.
—Yes, you__m_u__s_t .
No, you n__e_e_d_n_'_t _/_d_o_n.’t have to
Practice Complete the following sentences using modal verbs.
1. You’ve been working all day. You _m__u_s_t_ be very tired.
➢ He may be waiting for you at the station. 可能性
许可
➢—TMhaeyy
(Might) I may have
have a little brandy? got lost. may/might have
done
过去的猜测
—I N__o_,(ymouaym/cuasntn) 'gto. Y, bout'dI baemttenrotnqotu.ite sure.
may 和 might
➢1. M对amy aIyh的av一e a般lo疑ok问a句t y的ou肯r b定oo回k?答请可求用may或can, 但作否定回
➢答Y时o要u m用aymuussetnm'ta或y cdaicnt'ito。nary so long as you return it before 7:00.
➢You have to read between the lines because the real messages are often hidden… necessity 表必要性
➢It may seem lucky to you. possibility 表可能和推测
➢Astronauts must wear spacesuits when they work in space
2. was/were going to+We were about to go there when it begin to rain.
3. was/were about to do
4. She didn't say when she was coming again next time.
注意can 的惯用语
➢ On hearing the story , I cannot help laughing . ➢ You cannot be too careful with them. ➢ You can’t be careful enough.
cannot help + 动名词 忍不住做某事 cannot too /enough “无论怎么样..也不为过,越…越好”
You should be polite to your teachers.
4. should表示说话人的惊讶、愤怒、失望等特殊情感，意为“居然，竟然”。
Amazing! You should wear slippers at work.
must
1)must: 肯定句表有把握的推测:“一定”。 2)must: 推测现在或正发生的事情：must be doing，
will 和 would
1. Ask, if you will, who the owner is. 意愿 2. My friend asked if I would go with him. 过去的意愿 3. Will/Would you please have a coffee for me? 请求 4. This kind of clothes won’t wash easily. 5. That’s just like her—she would lose her bag in the bus!
2. 用于二、三人称的陈述句中, 表说话人命令、警告、允诺等口吻。
shHoeuslhdahllahveavdeotnhee表bo示ok本w该he做n某I f事ini（sh而re实ad际in上g.未做） 3s.hshoouuldldn表't示h劝av告e d、o建ne议表、示命本令，不用该于做各某种事人（称而。实际上做了）
eg: 他现在肯定呆在那里。He must be staying there. 3) must 推测已经发生的事：must have done I didn't hear the phone. I __m__u_s_t _h_a_v_e_b_e_e_n__a_s_le_e_p___
(我刚才没有听到电话，我想必是睡着了。)
would比will客气委婉
I will tell you something important tomorrow. （助动词） Will you marry me? （情态动词）
习惯
shall 和 should
11.Y. 在ou一s、ho三ul人d 称ha的ve疑a问sk句ed中f,osrhsaollm用e来h询elp问. 对方的意愿。 2. YSohualslhwouelbdeng’itnhoauvre lteoslsdohne?r the news.
2. —I wonder who that is.
—It c_a_n__’t_ be Lisa. She’s in the library at this time. 3. It is a long time since we met last time. Yoush_o_ucldome and see us more often.
because… obligation 表义务性 request 表请求或指示 ➢ May we ask what you’re doing in this country?
➢ You should/ought to/had better go to class right away. ➢What would you do if you were in her situation? advice 表建议
1. I asked him if Peter would arrive the next day. *与would+动词原形
1. would/should+动词原形
相比，was/were
2. She told me she was going to post the parcel. going to+动词原形有
4. I haven’t decided where I’m going for my holidays. I _m__a_y_ go to Australia. 5. My father’s birthday is coming. What _s_h_a_l_l I get him? 6. Why don’t you try on this dress? It __w_i_ll___ look nice on you.
如何表示否定的猜测？can’t
eg: She can’t have left school, for her bike is still here.
must用于一般疑问句中, 肯定: must 否定: needn’t/don’t have to（不必）， mustn’t表示“禁止，不允许”
— Must I finish all assignments at a time?
4. go, come, leave, start, meet等动词的过去进行时，表示就过去的某 一时刻而言即将发生的动作。
5. I felt nervous because I was soon to leave home for the first time.
过去将来时( The Past Future Tense)
过去将来时表示在过去某一时间将要发生的动作或存在的状态。 过去将来时常用在主句谓语动词为过去时态的宾语从句中。过去 将来时句子中有时包含时间状语 the next day、soon等。
过去将来时，表示从过去某一时间来看，将要发生的 动作或存在的状态。
Discovering useful structures in B3U5
Leading-in RADe.. nraeedqcuetehsssetitysenBEt..eapndocvseiscisebibliteylowCFa.. inonbdtelingthtaiotiinnonk about:
4.Can he still be alive after all this time? 猜测
5.If you’re not careful, you could get into even worse
trouble.
猜测
could 表请求，比can更委婉。 Could表推测的可能性比can 小
can/ could have done 本可以 can’t/ couldn’t have done 否定猜测
You mustn't worry about that.
Could you offer me work here?
TA.hneecfeussnitcytioBn. psoossfibmiliotydalCv.eorbbligsation
D. request E. advice
F. intention
1.Some of us can use the computer now, but we couldn’t
ten years ago.
能力
2.You can have my seat. I am going now. 许可
3.Could I have a drink of water, please? 请求
intention 表意图和愿望
Review of modal verbs
情态动词 1. 情态动词有一定的意义，表示或暗示某种情绪或态度，表示可
能、建议、愿望、必要、允许、能力等。 大多数情态动词有多 个意义。 2. 情态动词没有人称和数的变化，即不随主语的不同而变化。 3. 情态动词不能独立使用，须后接动词原形，一起构成谓语动词。 4. 情态动词除ought和have外，后面接不带to的不定式。(dare) 5.情态动词没有非谓语形式，即没有不定式、分词等形式。
What are the functions and meanings of these modal verbs? May we ask what you're doing in this country and what your plans are?
I can't say that I have any plans.
2.当mMa句yay中和可出m以i现g表ht“示I. a祝m愿n或ot希su望re”，等而表m示igh不t不确行定。含义的时候,常选用
M可ay能t性he：y be very happy in the future. Mcany y>ocuousuldcc>eemdaiyn >thme icgohmt ing year.
1. You _c_o_u__ld__h_a_v_e__h_a_d_ (have) a better mark if you went over
the vocabulary.
2. I saw him just now, so he _c_o_u__ld_n__’t__b_e_e_n__g_o_n_e_ (go) abroad.
情态动词的分类
1.只作情态动词的： can/could, may/might, ought to, must
2. 可情态可实义的： need, dare/dared
3. 可情态可助动词的: shall/should, will/would
4. 相当于情态动词的: have to, used to
can & could 能力，猜测，请求, 许可
— I’m not sure. It _m__ig_h__t be her brother.
8. I don’t know when the guests be here. Theyw_i_l_l _/_c_o_u_l_darrive at any time.
—Yes, you__m_u__s_t .
No, you n__e_e_d_n_'_t _/_d_o_n.’t have to
Practice Complete the following sentences using modal verbs.
1. You’ve been working all day. You _m__u_s_t_ be very tired.
➢ He may be waiting for you at the station. 可能性
许可
➢—TMhaeyy
(Might) I may have
have a little brandy? got lost. may/might have
done
过去的猜测
—I N__o_,(ymouaym/cuasntn) 'gto. Y, bout'dI baemttenrotnqotu.ite sure.
may 和 might
➢1. M对amy aIyh的av一e a般lo疑ok问a句t y的ou肯r b定oo回k?答请可求用may或can, 但作否定回
➢答Y时o要u m用aymuussetnm'ta或y cdaicnt'ito。nary so long as you return it before 7:00.
➢You have to read between the lines because the real messages are often hidden… necessity 表必要性
➢It may seem lucky to you. possibility 表可能和推测
➢Astronauts must wear spacesuits when they work in space
2. was/were going to+We were about to go there when it begin to rain.
3. was/were about to do
4. She didn't say when she was coming again next time.
注意can 的惯用语
➢ On hearing the story , I cannot help laughing . ➢ You cannot be too careful with them. ➢ You can’t be careful enough.
cannot help + 动名词 忍不住做某事 cannot too /enough “无论怎么样..也不为过,越…越好”
You should be polite to your teachers.
4. should表示说话人的惊讶、愤怒、失望等特殊情感，意为“居然，竟然”。
Amazing! You should wear slippers at work.
must
1)must: 肯定句表有把握的推测:“一定”。 2)must: 推测现在或正发生的事情：must be doing，
will 和 would
1. Ask, if you will, who the owner is. 意愿 2. My friend asked if I would go with him. 过去的意愿 3. Will/Would you please have a coffee for me? 请求 4. This kind of clothes won’t wash easily. 5. That’s just like her—she would lose her bag in the bus!
2. 用于二、三人称的陈述句中, 表说话人命令、警告、允诺等口吻。
shHoeuslhdahllahveavdeotnhee表bo示ok本w该he做n某I f事ini（sh而re实ad际in上g.未做） 3s.hshoouuldldn表't示h劝av告e d、o建ne议表、示命本令，不用该于做各某种事人（称而。实际上做了）
eg: 他现在肯定呆在那里。He must be staying there. 3) must 推测已经发生的事：must have done I didn't hear the phone. I __m__u_s_t _h_a_v_e_b_e_e_n__a_s_le_e_p___
(我刚才没有听到电话，我想必是睡着了。)
would比will客气委婉
I will tell you something important tomorrow. （助动词） Will you marry me? （情态动词）
习惯
shall 和 should
11.Y. 在ou一s、ho三ul人d 称ha的ve疑a问sk句ed中f,osrhsaollm用e来h询elp问. 对方的意愿。 2. YSohualslhwouelbdeng’itnhoauvre lteoslsdohne?r the news.
2. —I wonder who that is.
—It c_a_n__’t_ be Lisa. She’s in the library at this time. 3. It is a long time since we met last time. Yoush_o_ucldome and see us more often.
because… obligation 表义务性 request 表请求或指示 ➢ May we ask what you’re doing in this country?
➢ You should/ought to/had better go to class right away. ➢What would you do if you were in her situation? advice 表建议
1. I asked him if Peter would arrive the next day. *与would+动词原形
1. would/should+动词原形
相比，was/were
2. She told me she was going to post the parcel. going to+动词原形有
4. I haven’t decided where I’m going for my holidays. I _m__a_y_ go to Australia. 5. My father’s birthday is coming. What _s_h_a_l_l I get him? 6. Why don’t you try on this dress? It __w_i_ll___ look nice on you.
如何表示否定的猜测？can’t
eg: She can’t have left school, for her bike is still here.
must用于一般疑问句中, 肯定: must 否定: needn’t/don’t have to（不必）， mustn’t表示“禁止，不允许”
— Must I finish all assignments at a time?
4. go, come, leave, start, meet等动词的过去进行时，表示就过去的某 一时刻而言即将发生的动作。
5. I felt nervous because I was soon to leave home for the first time.
过去将来时( The Past Future Tense)
过去将来时表示在过去某一时间将要发生的动作或存在的状态。 过去将来时常用在主句谓语动词为过去时态的宾语从句中。过去 将来时句子中有时包含时间状语 the next day、soon等。
过去将来时，表示从过去某一时间来看，将要发生的 动作或存在的状态。
Discovering useful structures in B3U5
Leading-in RADe.. nraeedqcuetehsssetitysenBEt..eapndocvseiscisebibliteylowCFa.. inonbdtelingthtaiotiinnonk about:
4.Can he still be alive after all this time? 猜测
5.If you’re not careful, you could get into even worse
trouble.
猜测
could 表请求，比can更委婉。 Could表推测的可能性比can 小
can/ could have done 本可以 can’t/ couldn’t have done 否定猜测
You mustn't worry about that.
Could you offer me work here?
TA.hneecfeussnitcytioBn. psoossfibmiliotydalCv.eorbbligsation
D. request E. advice
F. intention
1.Some of us can use the computer now, but we couldn’t
ten years ago.
能力
2.You can have my seat. I am going now. 许可
3.Could I have a drink of water, please? 请求
intention 表意图和愿望
Review of modal verbs
情态动词 1. 情态动词有一定的意义，表示或暗示某种情绪或态度，表示可
能、建议、愿望、必要、允许、能力等。 大多数情态动词有多 个意义。 2. 情态动词没有人称和数的变化，即不随主语的不同而变化。 3. 情态动词不能独立使用，须后接动词原形，一起构成谓语动词。 4. 情态动词除ought和have外，后面接不带to的不定式。(dare) 5.情态动词没有非谓语形式，即没有不定式、分词等形式。
What are the functions and meanings of these modal verbs? May we ask what you're doing in this country and what your plans are?
I can't say that I have any plans.
2.当mMa句yay中和可出m以i现g表ht“示I. a祝m愿n或ot希su望re”，等而表m示igh不t不确行定。含义的时候,常选用
M可ay能t性he：y be very happy in the future. Mcany y>ocuousuldcc>eemdaiyn >thme icgohmt ing year.
1. You _c_o_u__ld__h_a_v_e__h_a_d_ (have) a better mark if you went over
the vocabulary.
2. I saw him just now, so he _c_o_u__ld_n__’t__b_e_e_n__g_o_n_e_ (go) abroad.
情态动词的分类
1.只作情态动词的： can/could, may/might, ought to, must
2. 可情态可实义的： need, dare/dared
3. 可情态可助动词的: shall/should, will/would
4. 相当于情态动词的: have to, used to
can & could 能力，猜测，请求, 许可