The number of deaths from heart disease will be reduced greatly if people are persuaded to eat

问题描述:

The number of deaths from heart disease will be reduced greatly if people are persuaded to eat
more fruits and vegetables.为什么这里要用will be reduced?为什么不是will reduced?请从语法角度解释.

因为心脏病死亡率不可能自己减少的,肯定是人为的努力减少的,所以是被减少,就相当于people will reduce the number of deaths from heart disease.