This structureThe way in which the parts of a sentence, clause or expression are arranged. E.g.: make somebody + infinitive in "The teacher made me rewrite the composition." can express actionA general term expressing that somebody or something does somethings that are fixed to happen at a determined timeA concept which is related to our perception of reality; that part of existence which is measured in seconds, minutes, hours, days, weeks, etc.:

You are due to hand in your home papers by the end of the month.

Modals expressing present and future necessity / obligation
Modals expressing present and future necessity / obligation BE TO + infinitive