A person swimming underwater in a swimming pool.
A swimmer is trying to hold their breath underwater
A person swimming underwater in a swimming pool doesn't mean that the person is trying to hold their breath underwater.
exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x3) & n_pool(x3) & of(x3,x4) & n_swimming(x4) & n_swimming(x1) & Time(x1,x2) & n_underwater(x2) & n_person(x1))
exists e1 p1 x1 x2 x3.(Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_hold(e2)) & n_underwater(x2) & of(x2,x3) & n_breath(x3) & of(x2,x1) & n_thing(x1) & n_swimmer(x1))