It is required that the machine be oiled as frequently as ne

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It is required that the machine be oiled as frequently as necessary
为什么用Be oiled而不用Must be oiled ,is oiled或者Will oil求详解

本句为虚拟语气, 在这里require , suggest 用法是类似的,都是虚拟语气
required 加从句要求从句that 主语+ （should）+谓语
所以这句话实际上是machine should be oiled as frequently as necessary
句中恰恰省略了（should）哦, 而should后面应该是加动词原型的.

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