I don't believe you did had done it.能不能写成I don't believe you did .表达的是一个过去的事情.

I don't believe you did had done it.能不能写成I don't believe you did .表达的是一个过去的事情.
I don't believe you did had done it.能不能写成I don't believe you did .
表达的是一个过去的事情.

I don't believe you did had done it.能不能写成I don't believe you did .表达的是一个过去的事情.
可以啊
看具体语境了
如果说我不相信你过去干了这是
就用后者
如果在语境里是指
不相信过去的某个时刻你就已经干了某事
就用前者

应该不能

不可以，I don't believe you did had done it.这句话里的did是强调的作用，不在意思上发挥作用，所以如果只用did的话就不对了。

原句中有did说明是强调句式，你改写后句义是对的，但没了强调

不可以
句中的did是强调的作用,它并不是过去事=时态的标志

改成I don't believe what you did.

强调句式,改写后语气较改写前减弱.