A man rides a bike in the woods.
A zombie rides a bike in the woods.
A man is not a zombie.
exists e1 x1 x2 x3.(n_wood(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & in(x2,x3) & n_bike(x2) & n_man(x1))
exists e1 x1 x2 x3.(n_wood(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & in(x2,x3) & n_bike(x2) & n_zombie(x1))