YOU SAID:
You need to finish up at work before you can go home
INTO JAPANESE
家に帰る前に仕事を終える必要があります
BACK INTO ENGLISH
I have to finish my work before I go home
INTO JAPANESE
家に帰る前に仕事を終えなければなりません
BACK INTO ENGLISH
I have to finish my work before I go home
You've done this before, haven't you.