YOU SAID:
Swimming is the best thing ever
INTO JAPANESE
水泳はこれまでで一番素晴らしいことだ
BACK INTO ENGLISH
Swimming is the best thing I've ever done.
INTO JAPANESE
水泳は私が今までやった中で最高のことだ。
BACK INTO ENGLISH
Swimming is the best thing I've ever done.
You've done this before, haven't you.