含情态动词的被动语态讲解及练习.docx

含情态动词的被动语态讲解及练习 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: 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