A brown dog and a tan dog are playing in tall grass.
the dogs are outdoors
Grass usually only grows outdoors, so if they are in the grass they are outdoors.
exists e1 s1 s2 s3 x1 x2 x3 x4.(in(e1,x4) & n_grass(x4) & a_tall(s3) & Theme(s3,x4) & Actor(e1,x1) & v_play(e1) & subset_of(x3,x1) & n_dog(x3) & a_tan(s2) & Theme(s2,x3) & subset_of(x2,x1) & n_dog(x2) & a_brown(s1) & Theme(s1,x2))
exists p1 x1.(n_dog(x1) & exists x2.((x1 = x2) & n_outdoors(x2)))