1. you/go from Siberia to Alaska by plane
You have to do from Siberia to Alaska by plane.
2. students/go to school on Sundays.
Students have to go to school on Sundays.
3. people who go trekking/wear socks
People who go trekking have to wear socks/
4. base jumpers/do special training?
Do Base jumpers have to do special training?
5. farmers/get up early?
Do Farmers have to get up early?