人教版英语九年级Unit 8 section A Grammar Focus 课件（16张PPT）

(共16张PPT)
Unit8 It must belong to Carla (Grammar Focus )
九年级全一册-Unit 8
情态动词must, may/might, could, can’t, can/could表推测的用法
教学目标
导入
—Where is Tom
—He 　　　　in his room. The light in his room is on.
A. mustn't be B. can be
C. can't be D. must be
在肯定句中一般用must表示一定、确定
知识点归纳
知识讲解
You are not allowed to play with fire in the forest. It 　　　　kill plants， animals and even people.
A. might B. might not
C. should D. should not
在肯定句中一般用may/might表示可能
知识点归纳
知识讲解
It _______(也许) get quite could here at night.
Can the red sweater be Tom's
—No, it can't. He can't stand red.
在肯定句中一般用could表示也许、或许
在疑问句中一般用can/could表示可能
在否定句中一般用can’t表示不可能
知识点归纳
could
知识讲解
一定，肯定，准是
知识讲解
难点突破
It must be Carla's .She loves volleyball .
Whose volleyball is this
“Must” to show that you think something is probably true .
知识讲解
难点突破
It could be Mei's hair band.Or it might belong to
Linda.They both have long hair .
Whose hair band is this
“Could” or “might” to show that you think something is possibly true .
可能
可能
注意！might表推测不用于疑问句，而could 可用于肯定句、否定句和疑问句。
知识讲解
难点突破
I'm not sure , but it can't be a dog .It was bigger .I think it might be a bear
or a wolf.
What did you see that night
“Can't” to show that you are
almost sure something is not true .
不可能
—Whose textbook is it Is it Jenny‘s
—No, it 　　　　be Jenny‘s. Look，Helen‘s name is on the cover. I think it 　　　　be Helen‘s.
A. can't; must B. mustn't; must
C. can't; may D. mustn't; may
You 　　　　walk on the wet hill path because you 　　　　fall and hurt yourself.
A. must; might not B. mustn't; might
C. needn't; need D. must; must
牛刀小试
I 　　　　be late，so don’t wait for me to start the meeting.
A. mustn't B. needn't C. need D. may
—Would you please tell me when to start
—I’m not sure. We 　　　　start at eight.
A. must B. could C. might D. need
—Mr. Wang is at his office. The light in his office is on.
—That 　　　　be him. He has gone to Australia.
A. must B. might C. could D. can’t
牛刀小试
课堂练习
难点巩固
Fill in the blanks with must,could ,might ,can't .
1.She live near here because she always walks
to work .
2.He be playing soccer outside .I saw him
reading in the library just now .
3.Peter come with us tonight ,but he
isn't sure .
4.A:I lost my schoolbag . I remember I still had my
schoolbag with me at the park .
B: So it still at the park
must
could
might/could
can't
拓展
难点巩固
Please finish these exercises .
1.He must (do) his homework now .
2.He could (come) here tomorrow .
3.Lucy didn't answer the phone last night .
He must (fall) asleep .
be doing
come
have fallen
对将来或现在的推测：情态动词+do/be doing
对过去的推测：情态动词+have done
小结
Summary
1.“Must” to show that you think something is probably true . 一定，肯定，准是
2.“Could” or “might” to show that you think something is possibly true .可能
注意！might表推测不用于疑问句，而could 可用于肯定句、否定句和疑问句。
3.“Can't” to show that you are almost sure something is not true . 不可能
对将来或现在的推测：情态动词+do/be doing
对过去的推测：情态动词+have done
(in the classroom)
A：I found a shcool uniform on the playground .
Do you know whose it is
B:It be Jack's , but I 'm not sure .(could/must)
A: It be his .I saw him wearing his own school uniform
just now .(mustn't/can/t)
C:It be Tom's .He is looking for it everywhere .(must/might)
(on the playground)
Tom: Oh , where is my school uniform
I can't find it .
Peter : It was here just now . It can't be lost .
Someone must it up .(pick)
could
can't
must
have picked
巩固练习
Thanks