Two boys kicking a ball over a net outside.
Boys swimming.
One can not be swimming and kicking a ball simultaneously.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & over(e1,x4) & n_outside(x4) & a_net(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_kick(e1) & n_ball(x3) & (x1 = x2) & n_boy(x1) & card_eq_2(x1))
exists s1 x1 x2.(n_swimming(x1) & a_.(s1) & Theme(s1,x1) & of(x1,x2) & n_boy(x2) & a_topic(x1))