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
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
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
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.
是因为本句是一个虚拟语气,从而省略了should ,本来应该是这样子的:It is required that the machine should be oiled as frequently as necessary.
一个语法规则:有require,necessary,suppose等的词语时,其从句的谓语要用动词原型或者用should加动词原型。