Children participating in activities on the beach.
Children playing on the beach.
Playing is a kind of activity, meaning children are doing activities by playing on the beach.
exists e1 x1 x2 x3 x4.(n_beach(x4) & a_topic(x1) & on(e1,x4) & in(e1,x3) & n_activity(x3) & Actor(e1,x2) & v_participate(e1) & (x1 = x2) & n_child(x1))
exists e1 x1 x2 x3.(n_beach(x3) & a_topic(x1) & on(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_child(x1))