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1、 第七单元语法知识含有情态动词的被动语态，情态动词有 should, may, might, can, could, must，will,would 等。1、基本句型结构：1、肯定句：主语+情态动词+be+过去分词（+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、否定句：主语+情态动词+not +be+ 过去分词（+by.)eg: Te
2、enagers 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+主语+be+过去分词（+by.)？eg: Should teenagers be allowed to go shopping?Yes, they should. No, they shouldnt.Can tables be m
3、ade 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、特殊疑问句：特殊疑问词+情态动词+主语+be+ 过去分词（+by.)？eg: What should teenagers be allowed?What can tables be made of?Whe
4、n 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：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 （主语）should （情态动词）allow （谓语）teenagers (宾语）to choose their own clothes. Tee
5、nagers （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：1. The old people should _(speak) to politely.2. Anna _(invite) t
6、o 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)?
