你表达的不太清楚。既然没有动作的发生者，那就用被动吧，一般都是这样。例如：Measures shoule be taken to stop the paper factory from polluting the river.这样吗？希望可以帮到你。
这个很明显是用被动语态
Measures should be taken to stop the paper-making factory from polluting the river.
Measures should be taken to prevent the paper factory from polluting the river.
We should take measures to stop the paper factory from polluting the river.
measures should be taken to stop the paper factory from polluting the river
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