the plane wasn't too badly damaged,but over the years,the crash was forgotten and the wreckremained undisturbed.里面的这一句the crash was forgotten,我想问,事故被遗忘,不是应该用forgot吗,用过去式就行了,这里为什么要用

the plane wasn't too badly damaged,but over the years,the crash was forgotten and the wreck
remained undisturbed.里面的这一句the crash was forgotten,我想问,事故被遗忘,不是应该用forgot吗,用过去式就行了,这里为什么要用过去分词

被动式是be动词加过去分词哦