A shirtless man is riding a motorcycle.
The policeman is patrolling the town.
Not every shirtless man is a policeman.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_motorcycle(x2) & n_man(x1) & a_shirtless(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_town(x2) & n_policeman(x1) & Theme(e1,x2) & Actor(e1,x1) & v_patrol(e1))