Two kids playing with a dog.
The children have never played with a dog before.
Children who have never played with a dog cannot be playing with a dog.
exists e1 x1 x2 x3.(a_topic(x1) & with(e1,x3) & n_dog(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_kid(x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(n_child(x1) & a_never(s1) & Manner(e1,s1) & with(e1,x2) & r_before(x2) & n_dog(x2) & Actor(e1,x1) & v_play(e1))