Three boys on an intertube in water
Kids are swimming in the pool.
The kids are in water, but not necessarily in the pool.
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & in(x2,x3) & n_water(x3) & n_intertube(x2) & n_boy(x1) & card_eq_3(x1))
exists e1 x1 x2.(n_pool(x2) & in(e1,x2) & Actor(e1,x1) & v_swim(e1) & n_kid(x1))