含情态动词的被动语态讲解及练习

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。一、基本句型结构：1肯定句：主语+情态动词+be+过去分词（+by.） eg: Teen agers should be allowed to go shopp ing.Tables can be made of ston es.The work must be fini shed today.The flowers may be pla nted in February.2、否定句：主语+情态动词+not +be+ 过去分词（+by.） eg:

2、 Teenagers shouldn t be allowed to go shopping.Tables cantbe made of ston es.The work mustn tbe finished today. （mustn t 加?mt】： 不能）The flowers mayn t me ?it be pla nted in February.3、一般疑问句：情态动词 +主语+be+过去分词（+by.）? eg: Should tee nagers be allowed to go shopp ing?Yes, they should. No, they should n t.

3、Can tables be made of stones? Yes, they can. No, they cant.Must the work be fini shed today?Yes, it must.No, it needn t./ No, it don thave to.May the flowers be pla nted in February? Y es, 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 tee nagers be allowed?What can

4、tables be made of?Whe n must be work be fini shed?Whe n may the flowers be pla nted?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_ the

5、ir 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：1. The old people should（speak） to politel

6、y.2. Anna（in vite） to my birthday party.3. Teen agers should（allow） to surf the In ternet.4. We should clean the classroom every day.（被动语态）The classroomevery day.5. Eightee n-year-olds should be allowed to drink.（否定句）Eightee n-year-oldsallowed to drink.6. The lights should be turned off whe n you leave he classroom.（主动语态）Y