Unit 7 Teenagers should be allowed to choose their own clothes.单元语法聚焦 ( 七 ) 含有情态动词的被动语态含有情态动词的被动语态，其结构为“情态动词＋ be ＋及物动词的过去分词”。eg ： Teenagers should be allowed to go out with their friends. 应该允许青少年和朋友们外出。1 ．含有情态动词的被动语态的句型：(1) 一般疑问句。eg ： Must this work be done at once ？这项工作必须立即做吗？(2) 特殊疑问句。eg ： When must this work be done ？这工作必须在什么时候做？Where can the lost book be found ？这本丢失的书能在什么地方被找到？(3) 反意疑问句。eg ： This book shouldn't be taken out of the library ， should it ？这本书不应被带出图书馆，是吗？(4) 否定句。eg ： This work needn't be done at once. 这项工作没必要立即做。2 ．含有情态动词的被动语态的一般疑问句的回答：含有情态动词的被动语态的一般疑问句的回答应保留原情态动词，但must“”表 必须 时，其否定回答应用 needn't ， need“”表示 必要；必须 时，其肯定回答应用 must 。 eg ：—Should my homework be finished today ？我的作业应在今天完成吗？—Yes ， they should. 是的，应在今天完成。(No ， they shouldn't. 不，不应在今天完成。 )—Must his exercise book be handed in at once ？他的练习本必须立即上交吗？—Yes ， it must. 是的，必须立即上交。(No ， it needn't. 不，不必立即上交。 )一、根据句意，用括号内所给动词的适当形式填空。1 ． This bike can __________________(repair) by my uncle.2 ． Can these newspapers ______________(take) out of the library?3 ． The homework must _______________(do) this afternoon.4 ． The children shouldn't ______________(allow) to swim in the pool.5 ． These questions must _________________(answer) in English by you.be repairedbe takenbe donebe allowedbe answered二、单项选择。( )6.The flowers ________ every day.A ． must water B ． need be wateredC ． should be watered D ． should water( )7.Many of the stars ________ ...
