a dog in the beach
A dog is playing on the beach.
just because a dog in the beach doesn't  mean the dog is playing
exists x1 x2.(n_beach(x2) & a_topic(x1) & in(x1,x2) & n_dog(x1))
exists e1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1))