Someone is swimming in a pool.
Someone is in a swim race
Swimming in a pool does not imply that the swimmer is in a race.
exists e1 x1 x2.(in(e1,x2) & n_pool(x2) & Actor(e1,x1) & v_swim(e1) & n_person(x1))
exists p1 x1.(exists x2 x3.(in(x1,x2) & n_race(x2) & of(x2,x3) & n_swim(x3)) & n_person(x1))