A dog chases a toy in the grass with its owner in the background.
A dog and its owner are on the grass.
A dog chases a toy in the grass with owner in background implies they are both on the grass.
exists e1 x1 x2 x3 x4 x5.(n_background(x5) & n_owner(x4) & of(x4,x3) & n_thing(x3) & n_grass(x3) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & in(x2,x3) & with(x3,x4) & in(x4,x5) & n_toy(x2) & n_dog(x1))
exists p1 x1 x2 x3 x4.(n_grass(x4) & on(x1,x4) & subset_of(x3,x1) & n_owner(x3) & of(x3,x2) & n_thing(x2) & subset_of(x2,x1) & n_dog(x2))