A black dog is holding an orange toy in its mouth in the water.
A dog is sleeping in the grass.
If the dog is sleeping on the ground, implied by the grass, then it cannot be in water at the same time, also implying that it cannot be holding a toy.
exists e1 s1 x1 x2 x3 x4 x5.(n_water(x5) & in(e1,x5) & in(e1,x4) & n_mouth(x4) & of(x4,x1) & n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_toy(x2) & of(x2,x3) & n_orange(x3) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_sleep(e1) & n_dog(x1))