英语问题,关于主动语态变被动语态

英语问题,关于主动语态变被动语态
①
主动：They have recently opened a new college.
被动后 A new collage has been opened recently by them.（句子中的 recently 为什么要在opened 后）
②
主动：They have successfully carried out the Party's policy
被动后 The Party's policy has been successfully carried out by them.（句子中的 successfully 怎么又在谓语动词之前了?和第一句不一样啊~ 这句和①中的形容词有什么区别?）
③
主动：People looked down upon women in the past.
被动后 Woman were looked down upon in the past.（这句中,people 省略了是么?还有就是 in the past 这是定语么?所以要放在句尾?）


请高人讲解啊~我是彻底蒙圈了……