Children participating in activities on the beach.
Kids are doing activities.
Participating and doing activities don't imply doing an activity
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.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_activity(x2) & n_kid(x1))