A man pushing a cart near the subway.
The man is selling hotdogs.
The fact that a man is pushing a cart does not always mean that he is selling anything from it, and if he is, it could be many things other than hotdogs.
exists e1 x1 x2 x3 x4.(n_subway(x4) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_push(e1) & near(x3,x4) & n_cart(x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_sell(e1) & n_hotdog(x2))