英语必修3&4Unit 1 Festivals around the world评课课件ppt
展开这是一份英语必修3&4Unit 1 Festivals around the world评课课件ppt,共52页。PPT课件主要包含了情态动词用法,情态动词的语法特征,表请求,表意愿,表许可,Would,Saturday,Could,Exercise ,May等内容,欢迎下载使用。
1) 情态动词不能单独做谓语, 除ught和have外, 后面只能接不带t的不定式。
2) 情态动词没有人称, 数的变化, 但有些情态动词, 如can、will也有一般式和过去式的变化。
3) 情态动词的“时态”形式并不是时间区别的主要标志, 不少情况下, 情态动词的现在式形式和过去式形式都可用来表示现在时间、过去时间和将来时间。
只作情态动词的 can / culd, may / might, ught t, must可情态可实义的 need, dare 可情态可助动词的 shall / shuld, will / wuld相当于情态动词的 have t, had better
1) can的主要用法是: A. 表示体力或脑力的能力: eg. The girl can dance very well. B. 表示说话的推测﹑事物的可能性等: eg. Can the news be true? C. 在口语中, can可以表示请求或允许: eg. Can I sit here?
can表示“能够”时与短语be able t同义,但can只用于一般现在时或过去时,而后者可用于各种时态。另外,can表示个人有某种能力,而be able t表示某人通过努力、克服困难做成某事,相当于succeed in ding sth.;叙述过去事实时,最好用was / were able t,因为culd只表示过去具有某种能力。
如:Can yu understand the different kinds f English these peple are using?Tw years later, he was able t speak very gd Chinese.
2) culd的主要用法是: A. culd 是can的过去式, 表示与过去 有关的能力和推测: e.g. We all knew that the yung man culdn’t be a dctr. B. culd可以代替can表示请求, 但语气较can客气、委婉:
e.g. Culd yu lend me yur dictinary? Culd I use yur bike? 3) can和culd接动词的完成形式,表示可能已经做某事。can用在否定和疑问句中, 表示不相信、怀疑等态度。 e.g. They can't have gne ut because the light is still n.
以culd或wuld提问时,不能再以culd或wuld作答,而应该用can或will。如:—Culd I brrw yur dictinary?—Yes, f curse yu can.
may 和might : may 常用来表示: A. 表示请求、允许; 比can较为正式: e.g. May I cme in ? Yu may g nw. B. 表示说话人的猜测: “也许” “可能”: 通常只用于肯定句和否定句中。
e.g. --I believe the man is frm England. --But I may be wrng. The guest may arrive this afternn. 在肯定句中,may的可能性比can 高,may表示现实的可能性,can表示理论上的可能性。如:
The rad may be blcked. 这条路可能不通了。 The rad can be blcked. 这条路可能会是不通的。 在疑问句中,表示可能性用can。 如:Where can he be? 他会在哪呢?
C. 表示祝愿;但语气较正式: e.g. May yu succeed! May yu have a gd jurney! might 的用法有: 多在间接引语中表示过去的可能和允许。如: She said that he might take her bike. 她说他可以拿她的自行车去用。
除了在间接引语中以外,might 一般不表示过去的可能或者许可。如要表示过去的可能可以用culd, 表示过去的许可可以用was (were) allwed t 或者had permissin t 。 表示现在的可能,其可能性要比may 小。如:
She might g hme tmrrw. 说不定他明天会回家。 表示现在的许可, 语气比may较委婉, 一般用于疑问句(包括间接疑问句), 不可用于肯定句或者否定句。 如: Might I have a wrd with yu? 我可以和你说句话吗?
1. will是助动词或是情态动词? will用于构成将来时是助动词。用于表示“意志”“决心”“请求”是情态动词。wuld亦同理。 e.g. I will tell yu smething imprtant. 我要告诉你一些重要的事。 (助动词)
Will yu tell her that I'm here? 请您告诉她说我在这儿,好吗? (情态动词) 2. 在疑问句中用于第二人称,提出请求或询问。 e.g.: If yu want help - let me knw, will yu? 如果你需要帮助, 让我知道, 好吗?
Will yu type this, please? 请打印这个, 好吗? Wn't yu sit dwn? 请坐下, 好吗? 3. wuld比will客气委婉。 e.g.: Wuld yu help us, please? 请您帮助我们,好吗?
I’d g there with yu. 我要和你一块到那儿去。 Teacher wuldn’t allw it. 老师不会允许这件事。
shall和shuld:
1. shall用于构成将来时是助动词。 shall用于征求对方的意见,表示 “决心” 是情态动词。 e.g.: Perhaps I shall pay a visit t England this winter. 可能今年冬天我会去英国观光。 (构成一般将来时, 助动词)
Shall we g by train, Mm? 妈妈,我们乘火车去好吗? (用于征求对方的意见,情态动词) I shall g at nce. 我必须立即去。 (表 “决心”,情态动词)
shall可以用于第一、三人称的疑问句,表示征求意见或许可;还可用于第二、三人称的陈述句中,表示允诺、警告、命令或威胁等。如:Yu shall be punished if yu break the rule.
2. shuld表示义务、建议、劝告,意为 “应该”。 “shuld+ have+过去分词” 表示本应该在过去做但没有做。 eg: Yu shuld keep yur prmise. 你应该遵守诺言。 She shuld have passed the exam. 她应该通过考试的。
must和 have t
1.must用于一般问句中,肯定回答用must否定式用 needn’t或dn’t have t,做 “不必”, mustn’t表示“禁止,不允许”
— Must I finish all assignments at a time?
—Yes, yu must. N, yu needn't.
I dn’t like this TV set. We must buy a new ne. There was n mre bus. They had t walk hme.
2.表示“必须”这个意思时,must 和have t 稍有区别。must着重说明主观看法,have t 强调客观需要。另外,have t 能用于更多时态。
Yu must be the new teacher. He must be jking. There is nbdy here. They must have all gne hme.
3.must表示对某人某事的猜测, 作“准是”, “一定” , 一般用于肯定句中。对过去发生的事情作肯定判断用must have dne
He must cme and wrry her with questin, just when she was busy cking the dinner. Of curse,after I gave her my advice,she must g and d the ppsite.
4. must表示“偏要, 硬要”, 指做令人不快的事情
can / culd, may / might, shuld和must都可表示肯定的推测。can / culd表示客观可能性;may表示推测时,其语气不肯定;might语气更弱,表示某事实际发生的可能性;shuld表示确定或可能有的未来或期待;must表示比较肯定的语气。如:
I think advertisements can be quite dangerus.The newcmer may be dismissed by the cmpany.The rescue team shuld arrive by 5 ’clck this afternn.I think the ld wman must be a nice persn.
culd, might, wuld, shuld都可表示委婉语气。如:I wnder if yu culd let me use yur cell phne. Might I knw yur telephne number?
2. A: ______ Xia Feng find the rigin f Easter frm that bk? B: N, he _____________.
1. A: ______ yu like t g t a special event with us n Saturday? B: Yes, I _____________________ _________.
’d like t g with yu n
culdn’t find it
3. A: _____ I g with my friend t the harvest festival? B: Yes, yu _________________ ________.
4. A: If I want t be a dctr _______ I study science? B: Yes, yu __________________.
shuld study science
may g (with yur
5. A: He is very handsme. ____ he play the rle f the prince? B: N, he _______________________ ______.
can’t play the rle f the
6. A: The neighbur’ s children are lder this year. _______________ they stp playing tricks at Hallween? B: Perhaps, they __________ ________________________. __________________________ ____________.
r shuld stp playing tricks
playing tricks at Hallween
at Hallween
—I think I’ll give Bb a ring later in the week. —Yu _____. Yu haven’t been in tuch with him fr ages. A. will B. may C. have t D. shuld
I. Chse the crrect answer.
2. Jhn, lk at the time. _____ yu play the pian at such a late hur? A. Must B. Can C. May D. Shuld
3. There _____ any difficulty abut passing the rad test since yu have practiced a lt in the driving schl. A. mustn’t be B. shan’t have C. shuldn’t be D. needn’t have
4. The Wrld Wide Web is smetimes jkingly called the Wrld Wide Wait because it ______ be very slw. A. Shuld B. must C. will D. can5. Helen _____ g n the trip with us, but she isn’t quite sure yet. A. shall B. must C. may D. can
6. —Smene is kncking at the dr. _____ it be Venis? —N, it _____ be her; she left fr New Yrk this mrning. A. Can; mustn’t B. Might; can’t C. May; desn’t D. Can; can’t
7. Mike prmised his dctr he _____ nt drink, and he has never drunk ever since. A. might B. shuld C. culd D. wuld
8. —Is there a mvie n in the cinema tnight? —There _____ be. I will phne the cinema and find it ut. A. might B. shuld C. can D. must
9. When I was studying at Beijing University, I _____ take a walk alng the lake every evening. A. will B. wuld C. culd D. shall
10. Mr Brwn, many students want t see yu. _____ they wait here r utside? A. Shall B. Will C. Can D. Wuld
can; culdWhen I was yung I _____ climb any tree in the frest.Learning a language _____ be a real challenge.
II. 选用正确的情态动词填空。
may; mightI asked if I _____ g hme half an hur earlier tday.There ____________ nt be enugh mney t pay fr the repairs.
may / might
will; wuldWhen he gt lder, he _____ never d his hmewrk.Nancy _____ keep talking unless yu tell her t shut up.
shall; shuldBy nw, they ______ already be in Dubai.I _____ be replaced by smene frm the New Yrk ffice.
must; can’tYu _____ have stayed up. Yu lk s tired.Yu _____ be 45! I thught yu were abut 25 years ld.
Harvest and Thanksgiving festivals canbe very happy events. (P2)[考点] 情态动词can的用法。[考例1] It is usually warm in my hmetwn in March, but it _____ be rather cld smetimes. (福建 2008)A. must B. can C. shuld D. wuld
选B。can表示“可能”,意为“有时天气可能会相当冷”。must必须、肯定;shuld应该;wuld表示过去常常。
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