课件30张PPT。Teenagers should be allowed to choose their own clothes.Unit 7第三课时：Section A (Grammar Focus - 4c) 同学们，上一课学习的单词你们都掌握了吗？现在大家来检验一下，点击下面的音频开始听写吧！ 我们在Unit5学习了一般现在时的被动语态，在Unit6学习了一般过去时的被动语态，这节课我们一起来学习一下含有情态动词的被动语态。Grammar Focus含有情态动词的被动语态 英语中有两种语态：主动语态和被动语态。主动语态表示主语是动作的执行者；被动语态表示主语是动作的承受者。本单元重点讲解含有情态动词的被动语态。语法讲解考点 1含有情态动词的被动语态的构成 其结构为：情态动词＋be动词＋过去分词 常考的情态动词有：can/could，may/might，must，need，should等。 eg：Iron can be used to make all kinds of useful tools. 铁可以用来做各种各样有用的工具。 As a student, your homework must be finished by yourself.作为一个学生，你的家庭作业必须由你自己完成。典例Teenagers should _____ to take care of themselves from a young age. (临沂) A．educate B．be educating C．have educated D．be educated 【点拨】句中teenagers与educate之间为被动关系；情态动词should被动语态构成为“should ＋ be ＋ 过去分词”。 D考点 2含有情态动词的被动语态的句子结构注：表格中的(＋by＋宾语)可省略。典例 【点拨】句中exam与finish之间为被动关系，情态动词must被动语态构成为“must ＋ be ＋ 过去分词”。 Hurry up! The exam must _____ in 100 minutes. (株洲) A．finish B．be finished C．is finishedB1．You must clean your bedroom every day. Your bedroom must be cleaned every day． 2．Parents should encourage teenagers to do social work for their community. Teenagers_____.Rewrite the sentences according to the example.4a should be encouraged to do social work for their community3．Can Lucy do her homework tomorrow instead? Can_____？ 4．Do you think we must keep teenagers away from the Internet? Do you think teenagers_____？ 5．Parents should give teenagers chances to make their own decisions. Teenagers_____.should be given chances to make their own decisionsLucy’s homework be done tomorrow insteadmust be kept away from the Internet chance /t?ɑ?ns/，/t??ns/ n.机会；可能性考向chance 作可数名词，意为“机会”，表示“做某事的机会”，其后可接 to do sth.或 of doing sth.。 eg：It is a good chance to study (of studying) English. 这是一个学习英语的好机会。知识点1 eg：There will be many chances for me to talk to her. 我将有许多机会与她交谈。(1) chance作可数名词或不可数名词。表示“做某事的可能性”，通常后接“of＋动名词”或由that引导的同位语从句。 eg：There is no chance that he will change his mind.他不可能改变主意。 (2) chance的常用搭配拓展典例The people who are more confident have more _____ to make themselves successful.(德州) A．education B．chances C．pride D．excuses B【点拨】此题用词义辨析法。education 教育；chance 机会；pride 自豪；excuse 借口。根据句意“更自信的人有更多的_____使他们自己成功。”可知用“机会”比较符合。Should teenagers _____(ask) to move out when they start working? In many Western countries，teenagers _____ (allow) to move out at eighteen. Their parents believe that they should _____(edu ... ...
