A person is riding a green motorcycle.
The woman is riding a blue bicycle.
Not every person is a woman.  A green motorcycle is not a blue bicycle.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_motorcycle(x2) & a_green(s1) & Theme(s1,x2) & n_person(x1))
exists e1 s1 x1 x2.(n_woman(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x2) & a_blue(s1) & Theme(s1,x2))