Be to

be to (must do sth, to be obliged to do sth, need to do sth) - mieć coś do zrobienia, być zobowiązanym do zrobienia czegoś.

1. I'm to eat these donuts. [I will eat these donuts]
2. You are to clean the bathroom. [You shall clean the bathroom]
3. I am to finish this long article by tomorrow. [I have to finish this long article by tomorrow]
4. The government is to announce new fiscal regulations soon. [The government shall announce new fiscal regulations soon]
5. He was to repair this boat. [He had to repair this boat]
6. I'm to take these medications in the afternoon. [I need to take these medications...]