A tractor is sitting on the beach behind two people sitting in the sand.
the tractor is red
There is no way to know the color of the tractor - it might not be red.
exists e2 e1 x1 x2 x3 x4 x5.(n_sand(x5) & n_beach(x2) & behind(e1,x3) & in(e2,x5) & Actor(e2,x4) & v_sit(e2) & (x3 = x4) & n_people(x3) & card_eq_2(x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_tractor(x1))
exists s1 x1.(n_tractor(x1) & Theme(s1,x1) & a_red(s1))