Two guys are walking down a sidewalk.
two men are sitting down
Two guys cannot be walking and sitting down at the same time.
exists e1 s1 x1 x2.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_sidewalk(x2) & n_guy(x1) & card_eq_2(x1))
exists e1 s1 x1.(a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & card_eq_2(x1))