YOU SAID:
Harry potter is the best book series to ever have existed
INTO JAPANESE
ハリー ・ ポッターは、今まで存在した最高の本シリーズ
BACK INTO ENGLISH
Harry Potter is the best series ever existed.
INTO JAPANESE
ハリー・ポッターはこれまでに存在した最高のシリーズです。
BACK INTO ENGLISH
Harry Potter is the best series ever existed.
That didn't even make that much sense in English.