你一定是疯了英文

“他一定是疯了”用英语表达是：He must be crazy。望采纳，谢谢。

不对,That must be crazy!

I think i must be crazy.crazy 英[ˈkreɪzi] 美[ˈkrezi] adj. 疯狂的; 不理智的; 离奇的; 生气的; n. [俚语]疯子，怪人，政治狂人（尤指政治上持激进或极端主义态度、行为异常、不可思议的人）; [例句]People thought they were all crazy to try to make money from manufacturing人们认为他们简直是疯了，竟然想从制造业中赚钱。[其他] 比较级：crazier 最高级：craziest 复数：crazies

You must be cracy .

您好，您可以用：He must have been crazy。用这个虚拟语气来表示自己的看法。或者What a crazy man。用感叹句也是可以的。

It is so crazyHe must be mad