I would rather you didn't 正确
would rather +(that)从句,从句用sb.did...
其他用法 would rather do...
错误用法：would rather sb.do
would rather to do
would rather sb.to do
【俊狼猎英】 欢迎追问所给的答案是I would rather you not，又是怎么理解？是一种省略。其实就= you didn't