An old man in front of an Iron Man truck.
The man is working on the engine of the Iron Man truck.
Its not implied that there is a man working on the engine of this truck, just that he is standing in front of it.
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & of(x2,x3) & n_truck(x3) & of(x3,x5) & n_man(x5) & (x3 = x4) & ne_org_iron(x4) & n_front(x2) & n_man(x1) & a_old(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4 x5.(n_truck(x3) & (x3 = x5) & ne_org_man(x5) & (x3 = x4) & ne_org_iron(x4) & n_engine(x2) & n_man(x1) & on(e1,x2) & of(x2,x3) & Actor(e1,x1) & v_work(e1))