然而事实证明这只是一个梦 英文怎么说可不可以用However,the truth proved it just to be a dream.

然而事实证明这只是一个梦 英文怎么说可不可以用However,the truth proved it just to be a dream.
然而事实证明这只是一个梦 英文怎么说
可不可以用
However,the truth proved it just to be a dream.

然而事实证明这只是一个梦 英文怎么说可不可以用However,the truth proved it just to be a dream.
你的句子基本上正确了,但是有点小错误在里面,应该是 however,the truth proved to be a dream.
prove 这个词作为动词‘证明’来讲很特殊,如果prove 作为及物动词,后面直接接sth.这个sth.是有限制的,一般是表示证明了一个理论或者原理之类的,而prove作为一个不及物动词的话,常用prove to be+ 形容词/ 名词,表示证明是什么样的或者证明是一个什么东西.
这两点需要注意的.

however, it turned out to be just a dream.

However, it is proved to be just a dream.

But the fact that this is just a dream
应该可以用提问者的回答吧，翻译起来好像没错

But in fact that this is just a dream.
你的答案感觉像是翻译器出来的，不过语法上好像没错。

But the fact proved that it is just a dream.
But the fact proved it a mere dream.

it turns out to be a dream.

However, the truth proved it just a dream

This proved a dream.
prove可以作连系动词，过去式为proved，过去分词为proven，可以接名词或形容词作表语。希望我能帮助你解疑释惑。