be to

verb2

1. •
   Especially, to be expected to (do something).

   • You are to hand in your essay by Friday.
   • The CEO is to announce the new company strategy tomorrow.
2. •
   Ellipsis of be going to; will; would or should in past tense.

   • Strange things were to occur all over the country.
   • If we are to make it, we'd better get a taxi.