1、UNIT7语法篇____________________________________________________________________________________________________________________________________________________________________熟练掌握本模块的语法知识。含有情态动词的被动语态（should, may, might, can, could, must) 一、基本句型结构： 1、肯定句：主语+情态动词+be+过去分词．．．．（+by...)
2、 e.g.: Teenagers should be allowed to go shopping. Tables can be made of stones. The work must be finished today. The flowers may be planted in February. 2、否定句：主语+情态动词+not +be+ 过去分词．．．．（+by...) Tables can’t be made of stones. The work m
3、ustn’t be finished today. (mustn’t [ˈmʌsnt]: 不能） The flowers mayn’t [meɪnt] be planted in February. 3.一般疑问句：情态动词+主语+be+过去分词．．．．（+by...)？ e.g.:Should teenagers be allowed to go shopping? Yes, they should. No, they shouldn’t. Can tables be
4、made of stones? Yes, they can. No, they can’t. Must the work be finished today? Yes, it must. No, it needn’t./ No, it don’t have to. May the flowers be planted in February? Yes, they may. No, they mayn’t. 4.特殊疑问句：疑问词+情态动词+be+ 过去分词．．．．（+by...)？ e.g.: What should
5、 teenagers be allowed? What can tables be made of? When must be work be finished? When may the flowers be planted? 二、含有情态动词的主动语态与被动语态的转换： e.g.: 1). We （主语）can（情态动词） write（谓语） letters (宾语）in English.（宾语补足语） Letters （主语） can （情态动词）be written （谓语）in English
6、(宾语）by us. （宾语补足语） . Parents （主语）should （情态动词）allow （谓语）teenagers (宾语）to choose their own clothes.Teenagers （主语）should（情态动词） be allowed （谓语）to choose their own clothes (宾语）by their parents. （宾语补足语） 3). You （主语）must （情态动词）clean （谓语）your bedroom (宾语）every day.(时间状语） Your bedroom
7、 （主语）must （情态动词）be cleaned （谓语）every day (时间状语）by you.(宾语） （）1.Peopleunder18shouldn’t_______togotoanInternetbar.A.beallowedB.beallowC.allowD.areallowed（）2.Judywantstogetherhair_______inthehairdresser’s.A.cutB.cuttingC.tocutD.becut（）3.Ibelievethatallproblemscan_______,notmatterhow
