YOU SAID:
although everyone already knew that
INTO JAPANESE
誰もがすでにそれを知っていたが
BACK INTO ENGLISH
Everyone knew it already
INTO JAPANESE
誰もがすでに知っていた
BACK INTO ENGLISH
Everyone knew already
INTO JAPANESE
誰もがすでに知っていました
BACK INTO ENGLISH
Everyone knew already
Well done, yes, well done!