Two dogs in the water.
The two dogs are swimming in the water.
Just because the dogs are in the water doesn't mean that they are swimming.
exists x1 x2.(n_water(x2) & a_topic(x1) & in(x1,x2) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_water(x2) & n_dog(x1) & card_eq_2(x1) & in(e1,x2) & Actor(e1,x1) & v_swim(e1))