A dog catches a tennis ball.
A dog is sleeping on a chair.
A dog cannot be sleeping while he catches a ball at the same time.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_ball(x2) & of(x2,x3) & n_tennis(x3) & n_dog(x1))
exists e1 x1 x2.(on(e1,x2) & n_chair(x2) & Actor(e1,x1) & v_sleep(e1) & n_dog(x1))