英语九年级全册Section A多媒体教学ppt课件

这是一份英语九年级全册Section A多媒体教学ppt课件，共22页。PPT课件主要包含了two faces，a dog，two girls等内容，欢迎下载使用。
表示可能、怀疑、允诺、愿望、义务、必要、猜测等的动词就是情态动词。英语中表示推测的情态动词主要有 must,can, culd, may, might等。
语法重点：情态动词表推测
It must be Carla's .She lves vlleyball .
Whse vlleyball is this ?
“Must” t shw that yu think smething is prbably true .
must表示可能性最大的______推测，意思是______。只能用于肯定句。如果要表示“一定不”，应该用can’t。如果询问可能性时，应该用can。 e.g. He ______ ______ the answers. 他肯定知道答案。mustn’t 在英语中不能用于表示推测，但是可以表示“禁止，不允许”之意。
must knw
It culd be Mei's hair band.Or it might belng tLinda.They bth have lng hair .
Whse hair band is this ?
“Culd” r “might” t shw that yu think smething is pssibly true .
注意！might表推测不用于疑问句，而culd 可用于肯定句、否定句和疑问句。
I'm nt sure , but it can't be a dg .It was bigger .I think it might be a bear r a wlf.
What did yu see that night ?
“Can't” t shw that yu are almst sure smething is nt true .
e.g. Dn’t eat it. It ______ g bad. 不要吃它，可能坏了。 The plane ______ ______ put ff by the strm. 这趟飞机可能会因为暴风雨而推迟。 He ______ ______ the answers. 他肯定不知道答案。
can /culd用于表示某事有可能发生或可能是事实,意思是“会，可能”。can表示推测“可能性”时，一般用于否定句或疑问句。can’t表示______ 推测，意思是______。
culd be
can’t knw
may/might表示推测“可能性”时，意思是______。might不表示过去时态，语气更委婉，可能性更小。might表推测时，可用于否定句，但不用于疑问句。e.g. He __________ ______ ______ at hme, but I’m nt sure. 他可能不在家，但是我不确定。
might/culd nt be
It culd be __________. It als might be ______________.
Can yu guess what it is?
three birds
a beautiful face
Can yu guess what it is?It culd be ________________ It als might be ______________.
a white vase（花瓶）
It culd be ______.It als might be _________.
Culd A be bigger than B? In fact, A and B must be ____________.
Which ne is bigger, A r B?
the same size
1. must/culd/might/can’t d sth. 推测现在发生的动作。e.g.他一定有一辆小汽车。He ______ ______a car nw. 2. must/culd/might/can’t be ding sth. 推测正在发生的动作。e.g. 他们一定不在图书馆读书。They______ ______ reading in the library.他一定在家做作业。He ______ ______ ______ his hmewrk at hme.
must have
can’t be
must be ding
3. must/culd/might/can’t have dne sth. 推测已经发生的动作。e.g.他可能已完成了工作。He ____________ ______ ________ the wrk. 4. must/culd/might/can’t be dne sth. 表示被动语态的推测。 e.g.我的书包不可能被偷。My schlbag ______ ______ ______.
culd/might have finished
can’t be stlen
Fill in the blanks with must,culd ,might ,can't .
1.She live near here because she always walks t wrk be playing sccer utside .I saw him reading in the library just nw cme with us tnight ,but he isn't sure .4.A:I lst my schlbag . I remember I still had my schlbag with me at the park . B: S it still at the park ?
5. — Excuse me. Is this the right way t the Summer Palace? — Srry, I am nt sure. It _____ be. A. might B. will C. must D. can
6. — Isn’t that Ann’s husband ver there? — N, it _____ be him. I’m sure he desn’t wear glasses. A. can’t B. must nt C. wn’t D. may nt
7. —Lk! A bk is n the flr. Whse is it? —It _____be Rick’s. It has his name n it. A. mustn’t B. can’t C. must D. need 8. — Is Lisa at hme? — I’m nt sure. She _____ be n the way hme. A. can’t B. culd C. shuld D. need
Please finish these exercises .
1.He must (d) his hmewrk nw culd (cme) here tmrrw didn't answer the phne last night . He must (fall) asleep .
have fallen
对将来或现在的推测：情态动词+d/be ding
对过去的推测：情态动词+have dne
本单元学习的语法为（ ），所涉及到的情态动词有（ ），（ ），（ ）和（ ） （ ） 。表示“有根据的推论，语气肯定”用（ ） ；表示“一种可能性，推测或猜测，语气委婉，不那么肯定”，用（ ）或（ ）；表示“否定的可能性，语气肯定”用（ ）;语气稍弱表示否定的推测的还有（ ）和（ ）.
(in the classrm)A：I fund a shcl unifrm n the playgrund . D yu knw whse it is ?B:It be Jack's , but I 'm nt sure .(culd/must)A: It be his .I saw him wearing his wn schl unifrm just nw .(mustn't/can/t)C:It be Tm's .He is lking fr it everywhere .(must/might) (n the playgrund)Tm: Oh , where is my schl unifrm ? I can't find it .Peter : It was here just nw . It can't be lst . Smene must it up .(pick)
have picked