YOU SAID:

School is awful and should be illegal

INTO JAPANESE

学校はひどく、違法であるべきです

BACK INTO ENGLISH

School should be terrible and illegal

INTO JAPANESE

学校はひどく違法でなければなりません

BACK INTO ENGLISH

School must be terribly illegal

INTO JAPANESE

学校はひどく違法でなければならない

BACK INTO ENGLISH

School must be terribly illegal