英语动词有两种语态:主动语态和被动语态。
1.当我们不知道谁是动作的执行者,
2. 或者只需强调动作的承受者时,要用被动语态。
被动语态结构:be + 过去分词(PP) + (by …)
在改写中应注意:
1.把原来的宾语提到前面作被动语态的主语;
2.把动词变成“be + 过去分词”;
3.主动语态中的主语变为介词by的宾语。
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