A man is sitting on a chair in front of a stack of watermelons.
A man selling watermelons.
Just because the man is sitting in front of the watermelons doesn't mean he's selling them.
exists e1 x1 x2 x3 x4 x5.(in(e1,x3) & of(x3,x4) & of(x4,x5) & n_watermelon(x5) & n_stack(x4) & n_front(x3) & on(e1,x2) & n_chair(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_sell(e1) & n_watermelon(x3) & (x1 = x2) & n_man(x1))