“如果这一切都是真的”日语或英语怎么说？

日本语のは以下です。

すべてが真実なら、

すべてが真実なら、

If what you are thinking became true,then....

What is the whole sentence? Could be "if all of these are true" or if all of these were ture".

需用虚拟语气
if all these were true