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1、Unit 7 Teenagers should be allowed to choose their own clothesGrammar Focus语法精讲2含有情态动词的被动语态本单元的语法重点是：含有情态动词的被动语态。其结构为：情态动词(should,must,may,can,could等)+be+及物动词的过去分词。1.含有情态动词的被动语态的常见句式：(1)肯定句结构为：主语+情态动词+be+及物动词的过去分词+(by+宾语)。如:Your homework should be finished by yourself.你应该自己完成作业。(2)否定句结构为：主语+情态动词+not
2、+be+及物动词的过去分词+(by+宾语)。如:The book cant be taken out of the reading room.这本书不能拿出阅览室。(3)一般疑问句结构为：情态动词+主语+be+及物动词的过去分词+(by+宾语)。回答：Yes,主语+情态动词./ No,主语+情态动词+not.如:Should these young trees be watered every day?应该每天给这些小树浇水吗？Yes,they should./ No,they shouldnt.对，应该。/不，不应该。(4)特殊疑问句结构为：疑问词+一般疑问句？如:What should s
3、tudents be allowed to do?应该允许学生们做什么？2.含情态动词的主动语态变被动语态的变化步骤：(以should为例，见下图)主动语态：Teachers should allow students to play computer games.主语 动词原形 宾语 被动语态：Students shoud be allowed to play computer games (by teachers.)语法精练.用括号内所给动词的适当形式填空。1.Many more trees should_ (plant) this year.2.Must the work _(finis
4、h) by 6:30 this afternoon?3.Where can the lost boy_ (find)?4.Thanks to the Internet,different kinds of information can_ (learn) in a short time.5.The water should _ (not put) here.6.The bad food shouldnt be _(eat).7.The stars can _(not see) in the daytime.8.Can this kind of bike _ (buy) in that shop
5、?9.The fruit should _(keep) well during winter.10.Should I _ (allow) to make my own decisions?.按要求完成句子，每空一词。11.Nobody can answer the question.(改为同义句)The question _ _ answered by anybody.12.We should clean our teeth twice a day.(改为被动语态)Our teeth should _ _ twice a day.13.Can you take good care of the
6、 children?(改为被动语态)_the children_ _ good care of?14.The classroom must be cleaned after school.(对画线部分提问)_ _ the classroom_ _?15.We must wash our hands before meals.(改为被动语态)Our hands _ _ _ before meals.根据汉语意思完成句子，每空一词。16.更远的恒星有一天可能被参观。Farther planets_ _ _ one day.17.你不应该在动物园里喂动物。Animals _ _ _ by you i
7、n the zoo.18.青少年不应该允许吸烟。Teenagers_ _ _ _ _ _ .19.我们被允许周六晚上去看电影。We _ _ _ go to the movies on Saturday evening.20.不应该让他那么做。He _ _ _ _ do like that.参考答案：Grammar Focus.1.be planted2.be finished3.be found4.be learned5.not be put6.eaten7.not be seen8.be bought9.be kept10.be allowed.11.cant be12.be cleaned13.Can;be taken14.When must;be cleaned15.must be washed.16.may be visited17.shouldnt be fed18.should not be allowed to smoke19.are allowed to20.shouldnt be allowed to