two dogs play on the dry ground.
The dogs are playing on the ground.
Play on the dry ground and are playing on the ground are a rephrasing of each other.
exists e1 s1 x1 x2.(n_ground(x2) & a_dry(s1) & Theme(s1,x2) & on(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_ground(x2) & n_dog(x1) & on(e1,x2) & Actor(e1,x1) & v_play(e1))