2014年秋人教版九年级英语第七单元语法知识（含有情态动词的被动语态）

第七单元语法知识

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...) ．．．． 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: Teenagers shouldn’t be allowed to go shopping. Tables can’t be made of stones.

The work mustn’t be finished today. (mustn’t [?m?snt]: 不能） The flowers mayn’t [me?nt] 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 shouldn’t.

Can tables be 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...)？ ．．．． 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：

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.

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 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)?