YOU SAID:

so one day i was going to my mates house and when me and my friends were there

INTO JAPANESE

ある日、私は仲間の家に行き、私と友達がそこにいたとき

BACK INTO ENGLISH

One day I went to a friend's house and when I and my friend were there

INTO JAPANESE

ある日、友達の家に行って、友達と一緒にいたとき

BACK INTO ENGLISH

One day, when I went to my friend's house and was with my friend

INTO JAPANESE

ある日、友達の家に行って友達と一緒にいた時

BACK INTO ENGLISH

One day, when I went to my friend's house and was with my friend