Someone is swimming in a pool.
Someone goes for a swim
One may for go for a swim in a pool.
exists e1 x1 x2.(in(e1,x2) & n_pool(x2) & Actor(e1,x1) & v_swim(e1) & n_person(x1))
exists e1 x1 x2.(for(e1,x2) & n_swim(x2) & Actor(e1,x1) & v_go(e1) & n_person(x1))