A man is playing a xylophone.
There is a man eating dinner at a restaurant.
The man cannot be playing the xylophone while eating dinner.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_xylophone(x2) & n_man(x1))
exists p1 x1 e1 x2 x3 x4 x5.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_eat(e1) & at(x4,x5) & n_restaurant(x5) & n_dinner(x4) & (x2 = x3) & n_man(x2))