广州新东方酷学酷玩夏令营：

      当句子的主语是动作的执行者时，谓语的形式叫主动语态。当句子的主语是动作的承受者时，谓语的形式叫被动语态。被动语态由助动词be +过去分词构成，时态通过 be 表现出来。例如：

1 一般现在时：you are required to do this.
2 一般过去时：the window was broken by xiao ming.
3 一般将来时：the problem will be discussed tomorrow.
4 现在进行时：the road is being widened.
5 过去进行时：the new tool was being made.
6 现在完成时：the door has been painted.
7 过去完成时：he said that the work had been finished.
8 过去将来时：he said that the trees would be planted.

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