Kids playing in the ocean.
Kids are trying to ride the waves in the ocean.
There are other ways to play in the ocean besides trying to ride the waves.
exists e1 x1 x2 x3.(n_ocean(x3) & a_topic(x1) & in(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_kid(x1))
exists e1 p1 x1 x2 x3.(n_ocean(x3) & n_wave(x2) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2.(in(e2,x3) & Theme(e2,x2) & Actor(e2,x1) & v_ride(e2)) & n_kid(x1))