YOU SAID:
You are the most beautiful person I’ve ever seen
INTO JAPANESE
あなたは私が今まで見た最も美しい人です。
BACK INTO ENGLISH
You are the most beautiful people I have ever seen.
INTO JAPANESE
君は今まで見た女の中で一番綺麗な女だ。
BACK INTO ENGLISH
You are the most beautiful woman I have ever seen.
INTO JAPANESE
君は今まで見た女の中で一番綺麗な女だ。
BACK INTO ENGLISH
You are the most beautiful woman I have ever seen.
That didn't even make that much sense in English.