1、 第七单元语法知识第七单元语法知识含有情态动词的被动语态（含有情态动词的被动语态（should,may,might,can,could,must)1、基本句型结构：1 1、肯定句：主语肯定句：主语+情态动词情态动词+be+be+过去分词（过去分词（+by.)+by.)eg: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 2、否定句：主语、否定句：主语+情态
2、动词情态动词+not+not +be+be+过去分词（过去分词（+by.)+by.)eg:Teenagers shouldnt be allowed to go shopping.Tables cant be made of stones.The work mustnt be finished today.(mustnt msnt:不能）The flowers maynt ment be planted in February.3、一般疑问句：情态动词、一般疑问句：情态动词+主语主语+be+过去分词过去分词（+by.)+by.)？eg:Should teenagers be allowed t
3、o go shopping?Yes,they should.No,they shouldnt.Can tables be made of stones?Yes,they can.No,they cant.Must the work be finished today?Yes,it must.No,it neednt./No,it dont have to.May the flowers be planted in February?Yes,they may.No,they maynt.4 4、特殊疑问句：疑问词特殊疑问句：疑问词+情态动词情态动词+be+过去分词过去分词（+by.)+by.)？
4、eg:What should 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：二、含有情态动词的主动语态与被动语态的转换：eg: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(宾语）by us.（宾语补足语）2).Parents
5、（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（主语）must（情态动词）be cleaned（谓语）every day(时间状语）by you.(宾语）例题：例题：1.The o
6、ld people should _(speak)to politely.2.Anna _(invite)to my birthday party.3.Teenagers should _(allow)to surf the Internet.4.We should clean the classroom every day.（被动语态）The classroom _ _ _ every day.5.Eighteen-year-olds should be allowed to drink.（否定句）Eighteen-year-olds _ _ _ allowed to drink.6.The lights should be turned off when you leave he classroom.（主动语态）You _ _ _ the lights when you leave the classroom.7.What school rules do you think should be _(change)?
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