A man sitting on a trolley.
A man in a Trolley
A man sitting on a trolley requires that the man is in the trolley.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_trolley(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_trolley(x2) & n_man(x1))