YOU SAID:
It's the most beautiful thing I've ever seen in my life!
INTO JAPANESE
私の人生でこれまで見た中で最も美しいものです!
BACK INTO ENGLISH
The most beautiful thing I have ever seen in my life!
INTO JAPANESE
私が人生で見た中で最も美しいものです!
BACK INTO ENGLISH
The most beautiful thing I've seen in life!
INTO JAPANESE
私が人生で見た中で最も美しいもの!
BACK INTO ENGLISH
The most beautiful thing I've seen in life!
That didn't even make that much sense in English.