Children playing on the beach.
The children are inside the house.
If the children are playing on the beach, then it would be impossible for them to be inside the house.
exists e1 x1 x2 x3.(n_beach(x3) & a_topic(x1) & on(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_child(x1))
exists p1 x1 x2.(n_house(x2) & n_child(x1) & inside(x1,x2))