A man does mechanic work on a dune buggy.
A man is working on his dune buggy.
Just because a man does mechanic work on a dune buggy doesn't imply his dune buggy.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_buggy(x3) & a_dune(s2) & Theme(s2,x3) & n_work(x2) & a_mechanic(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2 x3.(on(e1,x2) & n_buggy(x2) & of(x2,x3) & n_dune(x3) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_work(e1) & n_man(x1))