A man is on the ground while a person on a skateboard talks to them.
Two men are riding skateboards.
man is contradictory to men
exists p1 x1 x2 x3 x4 x5.(n_ground(x5) & while(p1,x2) & to(x2,x1) & n_thing(x1) & on(x2,x3) & n_talk(x3) & of(x3,x4) & n_skateboard(x4) & n_person(x2) & on(x1,x5) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x2) & n_man(x1) & card_eq_2(x1))