An old man in gray is sleeping on a chair.
The man is drinking a beer in a pub.
One can't be sleeping and drinking.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_chair(x3) & Actor(e1,x1) & v_sleep(e1) & in(x1,x2) & n_gray(x2) & n_man(x1) & a_old(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_man(x1) & in(e1,x3) & n_pub(x3) & Theme(e1,x2) & Actor(e1,x1) & v_drink(e1) & n_beer(x2))