A young boy is playing with a yo-yo.
A boy has never touched a yo-yo.
If a boy is playing with a yo-yo it is not true that the has never touched a yo-yo...................................................
exists e1 s1 x1 x2.(with(e1,x2) & n_yo-yo(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(a_never(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_touch(e1) & n_yo-yo(x2) & n_boy(x1))