Children playing baseball in a public park.
Kids swimming
If children are playing baseball they are not swimming.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_park(x4) & a_public(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_baseball(x3) & (x1 = x2) & n_child(x1))
exists x1 x2.(n_swimming(x1) & (x1 = x2) & ne_nam_kids(x2) & a_topic(x1))