a black and white dog is wearing a red collar whilst walking on the grass.
A dog is rolling around in the sand.
A dog can't be walking and rolling around at the same time.
exists e1 e2 s1 s2 s3 x1 x2 x3 x4 x5.(n_grass(x5) & Theme(e2,x2) & Actor(e2,x1) & v_wear(e2) & on(e1,x5) & Actor(e1,x4) & v_walk(e1) & (x2 = x4) & n_whilst(x2) & of(x2,x3) & n_collar(x3) & a_red(s3) & Theme(s3,x2) & n_dog(x1) & a_white(s2) & Theme(s2,x1) & a_black(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_sand(x2) & in(e1,x2) & a_around(s1) & Manner(e1,s1) & Actor(e1,x1) & v_roll(e1) & n_dog(x1))