A boy is playing warning device.
The boy is taking a nap.
One cannot nap and be playing at the same time.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_device(x2) & of(x2,x3) & n_warning(x3) & n_boy(x1))
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_nap(x2))