新概念二册第17课最终

情态动词must
1.表达义务，≈ have to 必须
must 强调主观 I don’t like it. I must leave. 单一时态 不能用于will和shall 后 have to 强调客观 It’s late. I have to go 时态丰富（各种时态） have to / had to/ will have to
Listen in class, or you won’t understand what to do.
If you don’t listen in class, you won’t understand what to do.
1) Eat some breakfast, or you’ll get hungry at school.
Ifwk.baidu.comyou read the instructions carefully, you’ll know what to do.
— I want to get high scores. work hard, you will do well. — If you __________________________(work hard/ do well)
At an early stage of the play appear on the stage
①the sun was very bright . ② the boys are very bright . ③ he has a bright future.
bright
•
• Sock n. 短袜 Stocking n. （女用）长筒袜
Special difficulties
Grow and Grow up grow vi. 生长，成长，发育 Trees of the kind don’t grow in our country. How tall you’ve got! You’ve grown a lot. grow up 长成，成熟（其被动态表示长大成人） Lucy has grown up a lot since I last saw her.
5.-Is it OK if I watch TV for six hours? you watch too much TV, your eyes will hurt. -If_______________________________________ (you watch too much / eyes hurt).
appear v.扮演,登台 appearance n.外貌 disappear v. We can’t judge by his – appearance
disappearance n.
appear as : 扮演...角色
stage n. 舞台 阶段
• • • • on the stage： 在舞台上 in the stage： 在某一阶段
3.-I don’t like speaking English outside the classroom. you don’t practice, you won’t improve. -If_______________________________________ (not practice / not improve). 4.-Should I tell my teacher I don’t understand the homework? you tell her, she can help you. -If_______________________________________ ( tell her /can help you).
2.-It’s late, but I don’t want to go to sleep. you don’t get enough sleep, you’ll feel tired at school. -If _______________________________________ (not get enough sleep/ feel tired at school).
Now
Does she look young?
16 years ago
Do you think how old she is? She must be at least……
Discussion
1.How old is your mother/father? 2. Do they look young? 3.Does your mother have any good way to stay young? 4.Do they do a lot of exercises? 5.Do they use any cosmetics 【kɔz'metiks] (化妆品）? 6. Do you have any good suggestions for staying healthy?
1.-how can I remember my friends’ birthdays? you keep a note in your diary, you will remember. -If_______________________________________ (keep a note in your diary / remember).
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Special difficulties
Special difficulties
1.as:
prep. = in the position of 作为（1） e.g. He works as an engineer He works like an engineer （他不是工程师，但行为举止像工程师） conj. = because 因为（2） e.g. I cannot come as I am busy. = at the time when（3） e.g. As I was leaving the house , the postman brought a letter.. = in the way that 按照…的方式（4） e.g. Do as you are told.
must have to have got to 主观 客观 客观
必须
现在must do 表推测 过去must have done
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eg. 你必须少抽些烟。 You must cut down on smoking. I’m afraid I must go now. eg. Must you leave now? Yes, I must./ No, I needn’t.
e.g. I called very loud. He must have heard me.
Must
3. mustn‘t 表示禁止
e.g. You mustn't smoke here.
4. 表示抱怨 e.g. Why must it rain again on Sunday ?
Summary
If you don’t eat some breakfast, you’ll get hungry at school.
2) Hurry up! We’ll be late!
If you don’t hurry up, we’ll be late.
3) Read the instructions carefully. Then you’ll know what to do.
Listening to the tape and answer the questions:
What is my aunt? How old is she? What does she wear in her new play? What does she answer if anyone asks her age? Which singer do you think looks younger than his/her age? Would you like to be always young? And why? Do you like to guess others age or not?
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怎么保持容颜青春永驻
每天一斤水果 一杯牛奶（不含三聚氰胺） 一小时有氧运动（较缓和的运 动） 一个友情故事（书 …… ） 一个爱情故事（尽量 少看电视 伤皮肤的！） 一个笑话故事
at least 至少
in spite of this 尽管
appear on the stage as 在舞台扮演
before
Now
She is an actress, too. Which picture do you think is her now? She often appears on the stage as a young girl.
She is an actress， too. Which picture do you think is her now?
grown up 成长
have to
不得不
bright red dress 鲜艳的红色 A long black stocking长黑丝 Wear short socks 穿短袜
take part in 参加 a new play一个新剧
a girl of seventeen17岁的女孩
A bright orange –coloured dress
Lesson 17
Always young
will do 1.If he____________ doesn’t do (not, do it ), I___________(do) it.
will be 2.If you ____ are (be) late for school ,your teacher ________(be) angry. 3 If she________ wins (win) the prize ,we _______(be) will be happy. don’t eat (not,eat )so much ,I _________(get) will get 4.If I _________ thinner. 5.If you ______(tell) tell them, they _____________ won’t believe (not,believe) you. rains 6. I _________(stay) will stay at home,If it __________( rain). 7.If it ____________(not,rain) doesn’t rain ,I _________( will go go) out. 8. we __________(play) will play football, If it is _________(sun) sunny . 9.If she __________(become) becomes a star ,her parents ____________ won’t send (not,send) her away . will watch 10.He _________(watch) TV ,if he ______(be) is free.
Special difficulties
2. dress suit ：” 女服 ” “ 女礼服”
: “ 男装 ” “ （一套）衣服 ”
costume : 在特别场合下穿的衣服，如戏 服，化装舞会上的服装 e.g. All the actors wore the
fifteenth-century costumes
Must
否定表示不允许,禁止
mustn’t
否定表示不需要 needn’t ，don’t have to
Must
2. 表达推测 must+v. (原) 表示对现在情况的肯定推测
e.g. Mary must have some problem:
She keeps crying.
must+have+done 表示对过去情况的肯定推测