英语语法,从句,Levelsensorwillsendasignaltocontroller,whichinturnitwilltriggerthevalvetoturnoff,shuttingtheliquidflow.前半句没问题,后半句shuttingtheliquidflow是什么用法?为什么没有is或are?为什么是

Question

英语语法,从句,
Level sensor will send a signal to controller,which in turn it will trigger the valve to turn off,shutting the liquid flow.
前半句没问题,后半句shutting the liquid flow是什么用法?为什么没有is 或are?为什么是现在式?是不是省略了一些东西?

Answer 1

伴随状语,shut 这个动作和前面的 trigger the valve to turn off 的动作同时发生,即伴随.
另外楼主的句子which in turn it will trigger the valve to turn off里的it是多余的,应该删掉.否则句子有错误.