A child playing with a sword at the bottom of the stairs.
A child playing knights inside his house.
A child playing with a sword does not mean that the game is called knights.
exists x1 x2 x3 x4 x5.(n_stair(x5) & n_bottom(x4) & a_topic(x1) & at(x1,x4) & of(x4,x5) & with(x1,x3) & n_sword(x3) & n_playing(x1) & of(x1,x2) & n_child(x2))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & inside(x3,x4) & n_house(x4) & of(x4,x1) & n_male(x1) & n_knight(x3) & (x1 = x2) & n_child(x1))