Two men holding skateboards walk down a sidewalk.
The two men are sitting on a park bench.
Men can not walk down a sidewalk and be sitting on a park bench at the same time.
exists e1 e2 x1 x2 x3 x4.(down(e2,x4) & n_sidewalk(x4) & Actor(e2,x1) & v_walk(e2) & Theme(e1,x3) & Actor(e1,x2) & v_hold(e1) & n_skateboard(x3) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_man(x1) & card_eq_2(x1) & on(e1,x2) & n_bench(x2) & of(x2,x3) & n_park(x3) & Actor(e1,x1) & v_sit(e1))