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使用被动语态应注意的问题
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1. 当句子的主语是动作的执行者时，谓语的形式是主动语态。当句子的主语是动作的承受者时，谓语要用被动语态。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 story was told by her.
3）一般将来时：The problem will be discussed tomorrow.
4）现在进行时：The question is being discussed in the meeting room.
5）过去进行时：The new road was being made.
6）现在完成时：The novel has been read.
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 soon.
2. 一些特殊的被动结构
1）带情态动词的被动结构：
The problem must be solved soon.
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