英语：Unit_9_单元复习课件(人教新目标八年级上)
1 他7岁的时候开始学钢琴。
He started to learn the piano when he was 7.
2 老师一进教室，学生们就停止了讲话。
The students stopped talking as soon as the teacher came into the classroom.
• 32.一个和蔼而慈爱的祖母
a kind and loving grandmother • 33.一个滑冰冠军 a skating champion
• 34.中国著名的钢琴演奏家
the well-known Chinese pianist enjoy humming songs • 35.喜欢哼歌 • 36.音乐篇章 pieces of music
• • • • • •
18.谱写曲子 write music 19.一个电影明星 a movie star 20. 表演京剧 perform Beijing Opera 21.一个中国体操运动员 the Chinese gymnast 22.赢得一块金牌 win a gold medal 23.在世界锦标赛上
四、根据汉语意思完成英语句子 1. 史密斯先生1969年出生于英国。 was born in Mr. Smith ____________ English ____ 1969. in 2. 那个运动员正在为国家队效力。 national That player _____________ the______ team. is playing for 3. 她在世界锦标赛中获得了金牌。 medal world championships She won a gold ______ at the ______ ______. 4. 他四岁时学开始游泳。 was started swimmingwhen he ____ four He _______________ years old. 5. 老虎伍兹只有十个月大的时候就开始打高尔夫。 golfing Tiger Woods started _______ when he was months _____ ten _________ old. was
• 44. 动身去…
start for a place =leave for a place • 45 滑冰 ice skating
• 46.在某物（事）上花费（时间，金钱）
spend …on sth
花（时间或金钱）干某事spend …（in）doing sth．
• 重点句子 • 1. When was he born? He was born on January 21st 1978 • 2., How long did Charles Smith hiccup? He hiccupped for 69 years and 5 months. • 3, When did he start hiccupping? He started hiccupping in 1922. • 4, When did he stop hiccupping? He stopped hiccupping in 1990. • 5, You are never too young to start doing things.
五、根据情景，用合适的句子补全对话。 A: May I ask you some questions about yourself ? B: Sure, please. A: When were you born _________________? B: I was born in 1996. A: _______________________? Were you born in Beijing B: No, I wasn’t born in Beijing. I was born in When did you start going to school Nanjing . A: _________________________? B: I started going to school in 2001, when I was six years old. A: How long did you study here _____________________________? B: I studied here for only one year. By the way, Who do you admire ___________________? A: I admire Leonardo da Vince…
6.---What ____ your brother _____? C ----He’s creative and talented. A. does, look like B. does, like C. is, like 7. Sally spends an hour ___ English every day. D A. read B. to read C. reads D. reading B 8.Yunnan is famous ___ its beautiful scenery. A. of B. for C. as D. with 9. Fu Mingxia ____ an Olympic Champion when she B was 13 years old. A. becomes B. became C. become D. is becoming 10. My cousin’s father was born _____. B A. on 1963 B. in 1963 C. in October 5th, 1963
Unit 9 1.一个国际体育明星
an international sports stars
2.一位了不起的中国乒乓球运动
a great Chinese ( Brazilian ) ping-pong player
3.出生于 be born in ( on ) 4.有（保持）打喷嚏的世界记录 have ( keep ) the world record for sneezing start hiccupping 5. 开始打嗝 6. 开始做 begin / start doing (to do) sth. 7.在……年龄时 at the age of… 8. 开始学习钢琴 start to learn the piano
• 37.开始学习手风琴
begin to learn the accordion
• 38.参加、加入 take part in = join in = enter • 39.赢得一等奖 win the first prize • 40.第十四届肖邦国际钢琴比赛
the 14th Chopin International Piano Competition • 41.因为、由于 because of • 42.主修，专修 major in • 43.女子单打 women’s singles
三、单项选择 1. I read a book ____ Gone with the Wind a few days C ago. A. call B. calling C. called D. to call C 2. The little boy was ____ young ____ answer the question. A. so, that B. too, not to C. too, to D. such, that 3. What can I do _____ famous ? D A. become B. became C. becoming D. to become 4. Tiger Woods is a famous ___. C A. basketball player B. football player C. golfer 5. Mozart wrote a lot of ____. C A. piece of music B. musics C. pieces of music D. pieces of musics
birthday: 12/16/1770
start writirs
Beethoven was born on December 16th, 1770. He started writing music in 1779 and stopped in 1827. He wrote music for 48 years.
• • • • • • • • •
9. 停止正做的事 stop doing sth. 10. 停下来做某事 stop to do sth. 11.太…….而不…… too… to… 12. 例如 for example 13. 为……效力 play for 14. 与某人玩 / 玩耍某物 play with sb. / sth. 15. play the +乐器 16. play + 球类 17.国家队 national team
二.用括号中所给单词的正确形式填空。 violinist 1. Midori is one of the most famous ________ ( violin ). loving 2. Henry is a ________ ( love ) grandfather. We all like him. skating 3. I want to go _______ ( skate ) with my friends. 4. My brother is different from others , he is an __________ ( usual ) . unusual 5. The problem is too difficult for me to work __________ ( work ) out.
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人教版英语八年级上册Unit9_教材梳理复习课件
9. Refusing (P. 67)
refuse表示“拒绝”时，后常接名词或者动词不定式作宾语。 Most of the residents refused to move away from here.
考题在线6
（孝感）
My brother______to move the heavy box, but I didn't give up.
核心短语
核 心 短 语
15. too much homework 太多作业 16. another time 下次 17. Thanks for asking. 谢谢（你的）邀请。 18. have fun/have a good time 玩得开心点 19. the day after tomorrow 后天 20. the day before yesterday 前天 21. have tennis training 进行网球训练
核心短语
核 心 短 语
8. go to the doctor 去看医生 9. have to do sth. 不得不做某事 10. help my mom with housework 帮妈妈做家务 11. go to the movies 去看电影 12. go to the concert 去（看）音乐会 13. go to the baseball match /game 去（看）棒球赛 14. go to the mall 去商业街
考题在线1
I'm very busy these days. Last week I ______ the driving test. Now I'm
______ take part in the coming sports meeting.
refuse表示“拒绝”时，后常接名词或者动词不定式作宾语。 Most of the residents refused to move away from here.
考题在线6
（孝感）
My brother______to move the heavy box, but I didn't give up.
核心短语
核 心 短 语
15. too much homework 太多作业 16. another time 下次 17. Thanks for asking. 谢谢（你的）邀请。 18. have fun/have a good time 玩得开心点 19. the day after tomorrow 后天 20. the day before yesterday 前天 21. have tennis training 进行网球训练
核心短语
核 心 短 语
8. go to the doctor 去看医生 9. have to do sth. 不得不做某事 10. help my mom with housework 帮妈妈做家务 11. go to the movies 去看电影 12. go to the concert 去（看）音乐会 13. go to the baseball match /game 去（看）棒球赛 14. go to the mall 去商业街
考题在线1
I'm very busy these days. Last week I ______ the driving test. Now I'm
______ take part in the coming sports meeting.
人教新目标英语八年级英语上册《Unit9+Can+you+come+to+my+birthday+party》说课课件(共18张PPT)
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人教新目标英语八年级上册
Unit9 Can you come to my birthday pa，学法
说教学过程
一、说教学内容 今天我说课的内容是人教版八年级英语上册Unit 9 Can you come to my party?的第一课时，本节课 主要让学生学会发出邀请，接受以及拒绝邀请。 本课是本单元的第一课时，课型为speaking,主要 教学内容是重点词汇短语的掌握和运用，以及学 会用英语礼貌得体地向他人提出邀请，并能礼貌 地拒绝邀请并且陈述原因,能在教师的指导下参与 角色扮演等活动；能在上述口语活动中使用正确 的语音、语调。本节课学习内容SectionA1a.1c。
A: Can you come to my party? B: Sure, I’d love to. C： Sorry, I can’t. I have to …
D： I’d love to. But I must… F： I’m sorry, I can’t.
E：Sorry, I’m afraid I can’t . I’m going to…
五、说教学过程 （一）导入新课 教师在白板上出示一个生日蛋糕，说：“Next Sunday is my birthday , I want to have a party. Can you come to my party? Today we are going to learn Unit 9. Can you come to my party?
(二)呈现新课1a 教师在大屏幕上出示几幅图片，让学生说出图片 内容。内容分别如下： 1. prepare for an exam ______________________ 2. help my parents_____________________ 3. go to the doctor ______________________ 4. meet my friend ________________________ 5. have the flu____________________ 然后设计一个小游戏帮助同学们记忆这几个短语
人教新目标英语八年级上册
Unit9 Can you come to my birthday pa，学法
说教学过程
一、说教学内容 今天我说课的内容是人教版八年级英语上册Unit 9 Can you come to my party?的第一课时，本节课 主要让学生学会发出邀请，接受以及拒绝邀请。 本课是本单元的第一课时，课型为speaking,主要 教学内容是重点词汇短语的掌握和运用，以及学 会用英语礼貌得体地向他人提出邀请，并能礼貌 地拒绝邀请并且陈述原因,能在教师的指导下参与 角色扮演等活动；能在上述口语活动中使用正确 的语音、语调。本节课学习内容SectionA1a.1c。
A: Can you come to my party? B: Sure, I’d love to. C： Sorry, I can’t. I have to …
D： I’d love to. But I must… F： I’m sorry, I can’t.
E：Sorry, I’m afraid I can’t . I’m going to…
五、说教学过程 （一）导入新课 教师在白板上出示一个生日蛋糕，说：“Next Sunday is my birthday , I want to have a party. Can you come to my party? Today we are going to learn Unit 9. Can you come to my party?
(二)呈现新课1a 教师在大屏幕上出示几幅图片，让学生说出图片 内容。内容分别如下： 1. prepare for an exam ______________________ 2. help my parents_____________________ 3. go to the doctor ______________________ 4. meet my friend ________________________ 5. have the flu____________________ 然后设计一个小游戏帮助同学们记忆这几个短语
Unit 9【复习课件】八年级英语上册单元复习(人教版)
2 –周日，你能来我家吗？ --- 抱歉，我没时间。我有太多作业。
---____C_a_n__y_o_u__c_o_m__e_t_o_m_?y house on Sunday?
---____S__o_r_r_y_,_I’_m__n__o_t_a_v_a_i_la_b_l_e_._I_h_a?ve too much homework.
invitation /ˌɪnvɪ'teɪʃn/ n.邀请；请柬 turn down拒绝 reply /rɪ'plaɪ/ v.回答，回复 forward/'fɔː(r)wə(r)d/ v. 转交；发送，adv.向前，前进 delete /dɪ'liːt/ v.删除 print/prɪnt/ v.打印；印刷 sad /sæd/ adj.（令人）悲哀的/（令人）难过的 goodbye/ˌɡʊd'baɪ/ interj.&n.再见 take a trip去旅行 glad /ɡlæd/ adj.高兴；愿意 help out（帮助……）分担工作、解决难题 preparation /ˌprepə'reɪʃn/ n.准备，准备工作 glue /gluː/ n.胶水 without /wɪ'ðaʊt/prep.没有/不（做某事） surprised /sə(r) 'paɪzd/adj.惊奇的/感觉意外的
表推测
can’t 表不可能 could不确定推测
The red hat can’t be his, because his is black. He won’t do this. It could be wrong.
may表请求
语气委婉礼 貌
回答用 may/can
May I sit here?
---____C_a_n__y_o_u__c_o_m__e_t_o_m_?y house on Sunday?
---____S__o_r_r_y_,_I’_m__n__o_t_a_v_a_i_la_b_l_e_._I_h_a?ve too much homework.
invitation /ˌɪnvɪ'teɪʃn/ n.邀请；请柬 turn down拒绝 reply /rɪ'plaɪ/ v.回答，回复 forward/'fɔː(r)wə(r)d/ v. 转交；发送，adv.向前，前进 delete /dɪ'liːt/ v.删除 print/prɪnt/ v.打印；印刷 sad /sæd/ adj.（令人）悲哀的/（令人）难过的 goodbye/ˌɡʊd'baɪ/ interj.&n.再见 take a trip去旅行 glad /ɡlæd/ adj.高兴；愿意 help out（帮助……）分担工作、解决难题 preparation /ˌprepə'reɪʃn/ n.准备，准备工作 glue /gluː/ n.胶水 without /wɪ'ðaʊt/prep.没有/不（做某事） surprised /sə(r) 'paɪzd/adj.惊奇的/感觉意外的
表推测
can’t 表不可能 could不确定推测
The red hat can’t be his, because his is black. He won’t do this. It could be wrong.
may表请求
语气委婉礼 貌
回答用 may/can
May I sit here?
2013新人教版八年级英语上unit9复习课件
Unit 9 Can you come to my party？ Page 65 1. Prepare for an exam the party preparations 2. help my parents help sb do/to do/with 3. go to the doctor 4. meet my friend 5. have the flu
1. Tony didn't feel better ______ he took A some medicine. I guess he can go to school this afternoon. A．until B．when C．after D．Because
c 2. He ______the basket on the wall after entering the room yesterday. A．hang B．hangs C．hung D．hanged
5. Would you like______ some noodles? B A．have B．to have C．having D．Has 6. —My mother is ill. I have to look after her at home. D —______. A．Thank you B．Oh，I don't know C．Bad luck D．I'm sorry to hear that
1. I invited him ______ our school last year. A A．to visit B．visited C．visiting D．Visits 2. My best friend often invites me ______ delicious D food. A．enjoy B．enjoying C．enjoyed D．to enjoy D 3. Thanks a lot for______me______your house. A．invite；for B．invite；to C．inviting；for D．inviting；to
1. Tony didn't feel better ______ he took A some medicine. I guess he can go to school this afternoon. A．until B．when C．after D．Because
c 2. He ______the basket on the wall after entering the room yesterday. A．hang B．hangs C．hung D．hanged
5. Would you like______ some noodles? B A．have B．to have C．having D．Has 6. —My mother is ill. I have to look after her at home. D —______. A．Thank you B．Oh，I don't know C．Bad luck D．I'm sorry to hear that
1. I invited him ______ our school last year. A A．to visit B．visited C．visiting D．Visits 2. My best friend often invites me ______ delicious D food. A．enjoy B．enjoying C．enjoyed D．to enjoy D 3. Thanks a lot for______me______your house. A．invite；for B．invite；to C．inviting；for D．inviting；to
2016年秋人教版八年级英语上册课件：Unit 9 Can you come to my party (共44张PPT)
have to
must
♦She has to help her mother do the housework at home.她不得不在家帮助 妈妈做家务。 ♦We had to stay at home because it rained.因为下雨,我们不得不待在家里。 ♦We must leave now. 我们现在必须离开。 ♦He must look after his things. 他必须照看好他的东西。
12.(2015〃扬州中考)—You look pretty in green,
Kate.
—Thank you.I like green.Green
energy. A.can B.must C.shቤተ መጻሕፍቲ ባይዱuld D.has to
give me
A [提示:考查情态动词辨析。句意为“你穿上 绿色的衣服看起来漂亮,凯特。”“谢谢你。我 喜欢绿色。绿色能给我能量”。can能;must必 须;should应当;has to不得不。根据句意,故选A。]
14.(2015〃乐山中考)—Mom,the train is leaving in eight minutes.I go now. —Okay,Jim,call me when you get there.
A.may
B.must
C.can
B[提示:考查情态动词的用法。句意为“妈妈,火 车八分钟后就要离开了。我必须现在就走。” “好的,吉姆,当你到那里时,给我打个电话”。 由句意可知,选B。]
3.have to不能直接用来表示 否定或进行提问,需要借助助 动词;must的一般疑问句将其 提前即可。
♦Must he do his homework now? 他必 须现在做作业吗?
must
♦She has to help her mother do the housework at home.她不得不在家帮助 妈妈做家务。 ♦We had to stay at home because it rained.因为下雨,我们不得不待在家里。 ♦We must leave now. 我们现在必须离开。 ♦He must look after his things. 他必须照看好他的东西。
12.(2015〃扬州中考)—You look pretty in green,
Kate.
—Thank you.I like green.Green
energy. A.can B.must C.shቤተ መጻሕፍቲ ባይዱuld D.has to
give me
A [提示:考查情态动词辨析。句意为“你穿上 绿色的衣服看起来漂亮,凯特。”“谢谢你。我 喜欢绿色。绿色能给我能量”。can能;must必 须;should应当;has to不得不。根据句意,故选A。]
14.(2015〃乐山中考)—Mom,the train is leaving in eight minutes.I go now. —Okay,Jim,call me when you get there.
A.may
B.must
C.can
B[提示:考查情态动词的用法。句意为“妈妈,火 车八分钟后就要离开了。我必须现在就走。” “好的,吉姆,当你到那里时,给我打个电话”。 由句意可知,选B。]
3.have to不能直接用来表示 否定或进行提问,需要借助助 动词;must的一般疑问句将其 提前即可。
♦Must he do his homework now? 他必 须现在做作业吗?
人教版初中八年级上册英语《Unit 9 Can you come to my party》课件
Calendar October
日一二三四五六
12 3456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
What's today? Today is Monday the 11th.
What's the day after tomorrow? It is Tuesday the 12th .
Jake turned down(拒绝) the invitation.
Jake would love to come to the party.
But he's not __a_v_a_il_a_b_le_, because his family is _t_a_k_in__g_ a trip to Wuhan at the __en__d_ of this month to visit his aunt
her English so much. She can help buy
food and d__ri_n_k_s__. She can also help to b_r_i_n_g__ Ms. Steen to the party _w__it_h_o_u_t_
telling her.
Read Paragraph 2
I_t_i_s_o_n__n_e_x_t _F_r_id_a_y__th_e__2_8_th_.___
4. Who did David invite to the party?
_H_e__in_v_i_te_d__h_is__cl_a_s_s_m_a_t_e_s_to__th__e_p_a_r_ty_.
A. am not
2013人教新目标八年级英语上册unit9 Can you come to my party SectionA 课件
Unit 9 Can you come to my party ?
sectionA(1a-1c)
青县大杜庄中学 何忠辉
Unit 9 the words of P66and P67 prepare [prɪ'peə] v.使做好准备准备 prepare for 为…做准备 exam [ɪɡ'zæm] 考试 flu [fluː] 流行性感冒 available [ə'veɪləbl] 有空的； another time 其他时间 until [ən'tɪl] 到...时；直到…为止 hang [hæŋ] (hung [hʌŋ] )悬挂；垂下 hang out 闲逛 catch [kætʃ] 及时赶上；接住；抓住 invite [ɪn'vaɪt] 邀请 accept [ək'sept] 接受 refuse [rɪ'fjuːz] 拒绝
B:Sorry,I can’t. I have to meet my friend.
A: Can you come to my birthday party?
B:Sorry,I can’t.
I have the flu.患感冒
[flu:]
A: Can you come to my birthday party?
1.prepare for…为…做准备:
prepare for the evening party为晚会做准备
prepare sth. prepare a big meal准备一顿大餐
prepare to do sth. prepare to help others准备帮助其他人
pass the exam/test 通过考试
be free=be available
sectionA(1a-1c)
青县大杜庄中学 何忠辉
Unit 9 the words of P66and P67 prepare [prɪ'peə] v.使做好准备准备 prepare for 为…做准备 exam [ɪɡ'zæm] 考试 flu [fluː] 流行性感冒 available [ə'veɪləbl] 有空的； another time 其他时间 until [ən'tɪl] 到...时；直到…为止 hang [hæŋ] (hung [hʌŋ] )悬挂；垂下 hang out 闲逛 catch [kætʃ] 及时赶上；接住；抓住 invite [ɪn'vaɪt] 邀请 accept [ək'sept] 接受 refuse [rɪ'fjuːz] 拒绝
B:Sorry,I can’t. I have to meet my friend.
A: Can you come to my birthday party?
B:Sorry,I can’t.
I have the flu.患感冒
[flu:]
A: Can you come to my birthday party?
1.prepare for…为…做准备:
prepare for the evening party为晚会做准备
prepare sth. prepare a big meal准备一顿大餐
prepare to do sth. prepare to help others准备帮助其他人
pass the exam/test 通过考试
be free=be available
2013年人教新目标英语八年级上Unit9期末复习课件
27、look
forward to doing sth. 期望做某事， 10、reply to sth/sb.回答某人/回答某事， 11、What’s today? 今天星期几，几月几日？ 12、What’s the date today?今天几月几日？ 13、What day is it today?今天星期几？
结束语
Coording to the invitation.
Then fill in the blanks in the conversation.
Lisa: Hi, Simon, ______you come Can
party to my ________?
9、look
Exercises
1、 星期三你能来参加我的生日晚会吗?
Can you come to my birthday party on Wednesday ?
2、当然，我很乐意去。 Sure , I’d love to ./ I’d like to . 3、这个周末我有太多的作业要做。 I have too much homework to do this weekend . 4、很抱歉，我要去看电影。 I’m sorry , I’m going to the movies .
10、too
1. 星期六你能来我的聚会吗？ 2. 当然，我乐意去。 3. 对不起，我必须为数学考试而学习。 4. 明天晚上你能去看电影吗？ 5. 当然可以，听起来很棒。 6. 恐怕不行，我得了流感。 7. 他能去聚会吗？ 8. 不能。他得帮助他的父母。 9. 萨姆直到下周三才走。
1、on
much homework 太多的家庭作业， 11、go to the movies去看电影， 12、another time下次， 13、last fall 去年秋天， 14、hang out 闲逛， 15、after school 放学后， 16、on the weekend 在周末， 17、study for a test备考，
forward to doing sth. 期望做某事， 10、reply to sth/sb.回答某人/回答某事， 11、What’s today? 今天星期几，几月几日？ 12、What’s the date today?今天几月几日？ 13、What day is it today?今天星期几？
结束语
Coording to the invitation.
Then fill in the blanks in the conversation.
Lisa: Hi, Simon, ______you come Can
party to my ________?
9、look
Exercises
1、 星期三你能来参加我的生日晚会吗?
Can you come to my birthday party on Wednesday ?
2、当然，我很乐意去。 Sure , I’d love to ./ I’d like to . 3、这个周末我有太多的作业要做。 I have too much homework to do this weekend . 4、很抱歉，我要去看电影。 I’m sorry , I’m going to the movies .
10、too
1. 星期六你能来我的聚会吗？ 2. 当然，我乐意去。 3. 对不起，我必须为数学考试而学习。 4. 明天晚上你能去看电影吗？ 5. 当然可以，听起来很棒。 6. 恐怕不行，我得了流感。 7. 他能去聚会吗？ 8. 不能。他得帮助他的父母。 9. 萨姆直到下周三才走。
1、on
much homework 太多的家庭作业， 11、go to the movies去看电影， 12、another time下次， 13、last fall 去年秋天， 14、hang out 闲逛， 15、after school 放学后， 16、on the weekend 在周末， 17、study for a test备考，
2022 人教版英语八年级上册unit9--10单元语法复习课件
单项选择
4. What about _____ me a hand, Mary?
A. give
B. gives
C. giving
D. to give
5. Here is my phone number. You _____ call me anytime you like.
A. can
B. must
句型转换
4. Can you go shopping with me next Sunday? （改为同义句） ______________________ to go shopping with me next Sunday?
5. Why don’t you come here by bus? (改为同义句) ______________ come here by bus?
e.g. What about going fishing? = How about going fishing?
03
Grammar Focus
Can you come to my party on Saturday? Sure, I’d love to. Sorry, I must study for a math test.
拓展：
(2) 其他常见的表示请求的句式 Shall we….? “我们….好吗?” shall是情态动词，后面接动词原形。 e.g. Shall we go shopping tomorrow?
拓展：
(2) 其他常见的表示请求的句式 Let’s…! “让我们…吧！” let是使役动词。其后跟动词原形。 e.g. Let’s play basketball after class.
04
人教版英语八年级上册第九单元Unit9课件PPT
考点三、情态动词的答语
句型Leabharlann 肯定回答否定回答Can I…
Yes, you can . No, you can’t .
May I … Must I… Need I…
Yes ,you may. Yes, you must. Yes, you must.
No, you mustn’t. No, you can’t. No, you needn’t. No you don’t have to No, you needn’t
• turn into “变成；进入” • turn down “调低音量；拒绝” • turn up 调高音量 • turn off 关掉，关闭； • turn on 打开，发动 • turn over 移交给；翻阅；把…翻过来；
我的生活原则是把工作变成乐趣，把乐趣变成工作。 ——艾伯乐
My principle of my life is turn work into fun, and to turn it into a job.
②invite sb. to do sth. 邀请某人去做某事
辨析：receive，accept
accept
意为“接受”
receive
意为“收到”
指主观上愿意接受
指客观上收到或拿 到，但主观上不一 定会接受
eg: The day before yesterday, a handsome boy showed his love to me with 999 roses in his hand. I _______his roses, but I wouldn't like to________ his love.
• 【温馨提示】 • (1)情态动词的过去式表示比原形更委婉的语气。 • (2)mustn’t表示否定意义“禁止，不允许”。可与祈使句互换。例