Children playing checkers.
The kids are sleep.
Playing & sleeping are different activities.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_checkers(x3) & (x1 = x2) & n_child(x1))
exists p1 x1.(n_kid(x1) & exists x2.((x1 = x2) & n_sleep(x2)))