A small boy is pulling a small utility trailer.
A small boy is pulling a small utility trailer for his father.
A boy pulling a trailer is not necessarily pulling a trailer for his father.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_pull(e1) & n_trailer(x2) & of(x2,x3) & n_utility(x3) & a_small(s2) & Theme(s2,x2) & n_boy(x1) & a_small(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2 x3 x4.(for(e1,x4) & n_father(x4) & of(x4,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_pull(e1) & n_trailer(x2) & of(x2,x3) & n_utility(x3) & a_small(s2) & Theme(s2,x2) & n_boy(x1) & a_small(s1) & Theme(s1,x1))