这太不可思议了 用英文怎么说?

It is unbelievable.
或者 It is incredible
或者 直接 Incredile!!! 或 Unbelievable!!!
这几个都是最常见的

it's amazing~~
it's wonderful~~
个人觉得amazing比较好，比较地道，那些native speak比较常用

It's too incredible!

This is so amazing........!!!!

Unblievable..........................

it's incredible