YOU SAID:
This website is the best thing I've ever seen.
INTO JAPANESE
このウェブサイトは、私が今まで見た最高のものです。
BACK INTO ENGLISH
This website is the best thing I have ever seen.
INTO JAPANESE
このウェブサイトは、私がこれまで見た最高のものです。
BACK INTO ENGLISH
This website is the best thing I have ever seen.
That didn't even make that much sense in English.