He must finish his homework by tomorrow. 变成: His homework must be finished by tomorrow by him.
主动语态变被动语态时,主动语态句中的宾语变成被动语态句中的主语,主动语态句中的主语成为被动语态句中
主动语态变被动语态的基本方法 将主动语态的宾语变为被动语态的主语,将主动谓语变为被动谓语 (be+过去分词),将主动语态的主语变为by短语(在被动句中用作状语): He broke the cup. → The cup was broken by him. 【注意】若不强调动词执行者,被动语态中的by短语通常可以省略: 1). He was born in 1986. 他生于1986年。 2). What is this flower called? 这种花叫什么花?
含有被动语态的句子中的谓语动词都表示什么 含有被动语态的谓语动词结构为:be +动词的过去分词.被动语态也有时态的变化,其时态体现在助动词be上.如:will be +过去分词表示主语将被…… e.g.The bridge will be rebuilt next year.这座桥明年要被重建.