They swim laps across the pool.
The boys are on the swim team.
the boys is
exists e1 x1 x2 x3.(n_pool(x3) & n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_swim(e1) & across(x2,x3) & n_lap(x2))
exists p1 x1 x2 x3.(n_team(x2) & of(x2,x3) & n_swim(x3) & n_boy(x1) & on(x1,x2))