The referee must be fair to both teams.
- Sędzia musi być bezstronny.
There must be only but a few rules; moreover, they have to be simple.
- Zasad musi być mało, a co ważniejsze, muszą być proste.
An artist has to have a color-sensitive eye.
- Artysta musi mieć oko do kolorów.
He has to speak English.
- On musi mówić po angielsku.