A young boy laying on his back under a piece of furniture.
A boy is laying under furniture.
In both, the boy is laying under furniture. The first sentence just has more details.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & under(e1,x4) & of(x4,x5) & n_furniture(x5) & n_piece(x4) & on(e1,x3) & n_back(x3) & of(x3,x1) & n_male(x1) & Actor(e1,x2) & v_lay(e1) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(under(e1,x2) & n_furniture(x2) & Actor(e1,x1) & v_lay(e1) & n_boy(x1))