Two dogs play in the grass.
The dogs are floating in the air.
You need to be on the ground to play in the grass so you cannot be floating in the air at the same time.
exists x1 x2 x3.(n_grass(x3) & a_topic(x1) & in(x1,x3) & n_play(x1) & of(x1,x2) & n_dog(x2) & card_eq_2(x1))
exists e1 x1 x2.(n_air(x2) & n_dog(x1) & in(e1,x2) & Actor(e1,x1) & v_float(e1))