Two men are participating in a race.
A couple of guys are in a race.
A couple guys are in a race, participating in a race refers to the type of activity.
exists e1 x1 x2.(in(e1,x2) & n_race(x2) & Actor(e1,x1) & v_participate(e1) & n_man(x1) & card_eq_2(x1))
exists p1 x1 x2.(exists x3.(in(x1,x3) & n_race(x3)) & of(x1,x2) & n_guy(x2) & n_couple(x1))