1、九年级英语Unit 7情态动词被动语态知识讲解练习一、含有情态动词的被动语态1.含有情态动词的被动语态的结构情态动词(should/can/must/may/could等)+be+及物动词的过去分词eg: Teengersshould be allowededto go out with friends.青少年应该允许和朋友们外出。Many plantscan be plantedindoors.许多植物能种在室内。2.含有情态动词的被动语态的基本句式肯定句式：主语+情态动词+be+及物动词的过去分词+其他Childrenshould be allowedto go to the movies
2、 with friends on weekends.孩子们应当被允许周末和朋友们一起去看电影。否定句式：主语+情态动词+not+be+及物动词的过去分词+其他eg: Waste papershould not be thrownhere.废纸不应该被扔在这里。3.一般疑问句式：情态动词+主语+be+及物动词的过去分词+其他？eg:Shouldit be done by Li Ming?这件事应该由李明做吗？Yes,itshoulD.,itshouldnt.是的，应该。/不，不应该。4.含有情态动词的主动句与被动句之间的转换含有情态动词的主动句变为被动句时，要把主动句中的宾语变为被动句中的主语；
3、主动句中的谓语变为“情态动词+be+及物动词的过去分词；主动句中的主语变为介词by的宾语（如果不强调动作的执行者，by短语常可省略)。主动句：Shemust cleanher roomevery day. 主语 谓语 宾语被动句：Her roommust be cleaned(byher)every day. 主语 谓语 宾语她必须每天打扫她的房间。二、被动语态结构小结各种时态的被动语态形式归纳（以动词give为例)：一般现在时am/ is / are+done现在进行时am/ is / are+being done现在完成时have/has+been done一般过去时was/ were +
4、done过去进行时was/ were +being done过去完成时had+been done一般将来时will/shall + be done含有情态动词can/ must/ shoulD.+be done一、按要求完成句子，每空一词。1.Nobody can answer the question.(同义句改写）The question _ _ answered by anybody.2.We should clean our teeth twice a day.(改为被动语态）Our teeth should _ _twice a day.3.They should be allowe
5、d to take part in after-school activities.(变一般疑问句并作否定回答）_ they _ to take part in afterschoolactivities?No，they _ .4.You cant lend the magazine to others.(改为被动语态）The book _ _to others.5.The lights should be turned off before you leave the classroom.(改为主动语态）You _ _ off the lights before you leave the
6、classroom.二、单项选择（ )1.We should _junk food to keep healthy.A.lookforward toB.getalong withC.keepaway fromD.makefriends with( )2.Teenagers _allowed to smoke.A.should not be B.should be notC.not should be D.not be should( )3.He was not _,so he failed the exam.A.carefullyenough B.carefulenoughC.enoughca
7、refully D.enoughcareful( )4.The people who are more confident have more _ to make themselves successful.A.education B.excuses C.chances D.pride( )5.-Tom is always careless with his schoolwork.Could you help him?-No problem!I think he _tothink twice before startingA.should be told B.shouldnt be toldC
8、.should tell D.should told( )6.The dictionary may _for threeweeks.A.keepB.be keptC.borrow D.be borrowed( )7.-Whats the meaning of the activity Lets save?-Paper shouldnt _in our everyday life.A.waste B.wastedC.be wasted D.is wasted()8.Thanks to the Internet, different kinds ofinformation _in a short
9、time.A.can be learned B.can been learnedC.can learn D.can learned()9.The villagers expect that the building of thebridge _before the rainy seasoncomes.A.is completed B.was completedC.will be completed D.has been completed【答案】一、1.cant be2.Should beallowed3.Should beallowed shouldnt4.cant belent5.should turn二、CABCA BCAC3
