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(1)把主动语态的宾语变为被动语态的主语。 (2)把谓语变成被动结构(be+过去分词) (根据被动语态句子里的主语的人称和数，以及原来主动语态句子中动词的时态来决定be的形式)。 (3)把主动语态中的主语放在介词by之后作宾语，将主格改为宾格。例如： All the people laughed at him. He was laughed at by all people. They make the bikes in the factory. The bikes are made by them in the factory. He cut down a tree. A tree was cut down by him. (责任编辑：admin) |