1. 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 stole our money.Our money was stolen by him.【注】(1)若不强调动词执行者，被动语态中的by短语通常可以省略：The house was built in 1978. 这座房子是1978年建的。(2) 在转变语态时，要注意保持两种语态时态的一致性：The students will study the problem.The problem will be studied by the students.A friend of ours is repairing the roof.The roof is being repaired by a friend of ours.2. 双宾动词即指带双宾语的动词，它们在变为被动语态时，有以下两种情形值得注意：(1) 有些双宾动词(如award, buy, give, leave, lend, o
