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1、Unit 7 Teenagers should be allowed to choose their own clothes. community keepaway from make ones own decision educate manage society n. 社区；社团 避免接近；远离 自己做决定 v. 教育；教导 v. 完成；应付 n. 社会 Words and Expressions objectives To learn to use should + be allowed to to speak and discuss about what you are not all
2、owed to do. Agree and disagree. What can you do at school? What cant you do at school? School rules Dont arrive late for school. = Students are not allowed to arrive late for school. Dont run in the hallways. School rules = Students are not allowed to run in the hallways. School rules Dont eat in th
3、e classroom. = Students are not allowed to eat in the classroom. School rules Dont listen to music in the classroom. = Students are not allowed to listen to music in the classroom. School rules Dont fight with others. = Students are not allowed to fight with others. School rules = Students are not a
4、llowed to cheat. Dont cheat. School rules Dont wear long hair. (boys) = Boys are not allowed to wear long hair. School rules = Students are not allowed to sleep in class. Dont sleep in class. I dont think sixteen-year-olds I agree. They arent should be allowed to drive. serious enough. Do you think
5、teenagers should be No, I dont agree with encouraged to make their own this. Teenagers are too decisions? young to make their own decisions. Teenagers should not be allowed I disagree. They can learn to have part-time jobs. a lot from working. Do you think we may be allowed If you dont use a flash,
6、to take some photos if we dont then it may be OK. use a flash? Grammar Focus 一般现在时的被动语态 在英语中，动词有两种语态，即主动语态 和被动语态。被动语态的基本结构是“助动 词 be + 及物动词的过去分词”，其中助动 词be有人称、数和时态的变化,其变化规则 与be作为连系动 完全一样。 1.一般现在时被动语态的各种句式结构 肯定式 主语+am/is/are+过去分词（ + by) 否定式 主语+am/is/are + not +过去分词 (+by) 疑问式 Am/Is/Are+主语+过去分词(+ by )? 特
7、殊疑问词+ am/is/are+主语+过去分词（+ by .)? 被动不离“be” “p.p.”, “p.p.”前面助动be。 主谓一致莫忘记，am, is, are现在时。 2.一般现在时被动语态的基本用法 用法 示例 表示经常性或习惯 性发生的被动动作 I am often asked the question by my pupils. 表示近期正在发生 的被动动作 These days people are moved by a teacher named Zhang Lili. 描述某种常态化的 被动的客观事实 The spaceship is mainly controlled b
8、y computer. 强调目前存在的针 对行为主体人的被 限制性动作 You arent allowed to take photos. 3.主动语态变为被动语态的方法 第一步:将主动语态的宾语改为被动语态的主语； 第二步:将主动语态的谓语改为“be+及物动词的过去 分词”结构； 第三步:将主动语态的主语改为介词by的宾语，放在 谓语之后(有时可省略)。 如图示： They (主语）grow (谓语）tea (宾语）in the south-east of China. 被动语态: 主动语态: Tea (主语）is grown (谓语）by them in the south-east of
9、 China. 句式结构示例 肯定句主语+情态动词+be+及物动词 的过去分词(+by) Teenagers should be allowed to go shopping. 否定句主语+情态动词+not+be+及物 动词的过去分词(+by) The word cant be used in this sentence. 一般疑问句 情态动词+主语+be+及物动词 的过去分词(+by)? Must the work be finished today? 特殊疑问句特殊疑问词+被动语态的一般 疑问句？ Who should be asked for help? 含有情态动词的主动句变为被动句时
10、，谓语动词部分 改为“情态动词+be+及物动词的过去分词”。 We can write Letters can be written letters in English. in English by us. 改为被动语态 4a Rewrite the sentences according to the example. 1. You must clean your bedroom every day. Your bedroom must be cleaned every day . 2. Parents should encourage teenagers to do social wor
11、k for their community. Teenagers _ _ . should be encouraged to do social work for their community 3. Can Lucy do her homework tomorrow instead? Can_ _ ? Lucys homework be done by her tomorrow instead 4.Do you think we must keep teenagers away from the Internet? Do you think teenagers _ _ ? must be k
12、ept away from the Internet 5. Parents should give teenagers chances to make their own decisions. Teenagers _ _ . should be given chances to make their own decisions 4b Fill in the blanks with the correct forms of the words in brackets. Should teenagers _(ask) to move out when they start working? In
13、many Western countries, teenagers _(allow) to move out at eighteen. Their parents believe that they should _(educate) to take care of themselves from a young age. This way, when they _(start) working they can manage their own lives. However, in most Asian be asked are allowed be educated start societies, it is not common for teenagers to _(move) out. Chinese parents believe that it is better for children to live with parents who can _(take) care of them. But the young should then
