Используйте правильный модальный залог:must,have to или should.
1....see it.its the best film lve ecer seen.
2.He...enter this room.its dangerous.
3.English children...stay at school till the age of 16.
4.i think you...learn Spanish if you want to work there.
5.You...walk across the street of the crossing.
6.You buy coffee in the cafeteria.