A boy climbing a tree.
A boy climbs his favorite tree.
A boy climbing a tree cannot be assumed to be climbing his favorite tree.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_climb(e1) & n_tree(x3) & (x1 = x2) & n_boy(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & n_tree(x2) & a_favorite(s1) & Theme(s1,x2) & of(x2,x1) & n_male(x1) & n_boy(x1))