YOU SAID:
Marty, you have to come back with me!
INTO JAPANESE
マーティ、あなたは私と一緒に戻ってきている!
BACK INTO ENGLISH
Marty, you come back with me!
INTO JAPANESE
マーティ、あなたは私と一緒に戻ってくる!
BACK INTO ENGLISH
Marty, you come back with me!
That didn't even make that much sense in English.