The operation John had was not successful.为什么用had呢,

题目

The operation John had was not successful.为什么用had呢,
整句意思不是John的手术没有成功吗,为什么用had呢,
我知道是定语从句，可是为什么还有was

答案

这是一个定语从句啊the operation 是先行词 省略了that 完整的是th oparation that John had was not sucessful.意思是 John的手术不成功看到补充了 was是主句的谓语 也就是the operation的谓语 John had是修饰the o...