A young man climbs the bottom surface of a rock.
the boy was listening
A young man who climbs is not necessarily a boy and not necessarily listening
exists e1 s1 s2 x1 x2 x3.(n_surface(x2) & a_bottom(s2) & Theme(s2,x2) & Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & of(x2,x3) & n_rock(x3) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1.(n_boy(x1) & Actor(e1,x1) & v_listen(e1))