A boy reads a book.
The boy is playing Nintendo.
A boy that reads a book cannot be playing Nintendo at the same time.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_book(x2) & n_boy(x1))
exists e1 x1 x2.(ne_org_nintendo(x2) & n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1))