YOU SAID:

get ready we have to leave soon

INTO JAPANESE

すぐに出発しなければなりません

BACK INTO ENGLISH

Have to leave immediately

INTO JAPANESE

すぐに出なければならない

BACK INTO ENGLISH

Must leave immediately

INTO JAPANESE

すぐに出発する必要があります

BACK INTO ENGLISH

Must depart immediately

INTO JAPANESE

すぐに出発する必要があります

BACK INTO ENGLISH

Must depart immediately