A man is on the ground while a person on a skateboard talks to them.
A man speaks with a person on a skateboard.
Speaks and talks is the same thing.
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 x3.(on(e1,x3) & n_skateboard(x3) & with(e1,x2) & n_person(x2) & Actor(e1,x1) & v_speak(e1) & n_man(x1))