YOU SAID:
How have you been my great friend, I've missed you so.
INTO JAPANESE
どうしてあなたは私の偉大な友人だったのですか?
BACK INTO ENGLISH
How come you were my great friend?
INTO JAPANESE
どうしてあなたは私の偉大な友人でしたか?
BACK INTO ENGLISH
How come you were my great friend?
You should move to Japan!