Firefighters hard at work.
The firefighters are enjoy a day at the beach on Mars.
One cannot be at work and enjoying a day at the beach simultaneously.
exists s1 x1 x2.(at(s1,x2) & n_work(x2) & Theme(s1,x1) & a_hard(s1) & n_firefighter(x1))
exists p1 s1 x1 x3 x4.(ne_geo_mars(x4) & n_beach(x3) & n_firefighter(x1) & a_enjoy(s1) & Manner(p1,s1) & exists x2.((x1 = x2) & at(x2,x3) & on(x3,x4) & n_day(x2)))