don't drive so quickly again与not do it again

But you had better not do it again
是否可以换成But you had better don't drive so quickly again
是否对?
TKS

不对
you had better do...你最好做什么是固定用法，如果要表达你最好不要做什么直接在do前加not即可

不行，sb. had better do/not do 是固定搭配。

看语境，如果上文有关于drive 的事，可以换～～

把二句中的don't 换成not 就可以了 再看看别人怎么说的。