you'd better not do it..能说成you'd better don't do it.或者you'd

you'd better don't do it这是错误的 you'd better do not it.这也是错的 这个没什么理由的 是一种句型 告诉你 你只要几住就可以了 had better后面+动词原形 肯定句就是：had better后面+动词原形 否定句就是：had better bot后面+动词原形