A man and a woman are riding on a motorized scooter.
A man and woman are riding a blue scooter.
There is nothing to indicate the colour of the  motor scooter is blue.
exists e1 e2 x1 x2 x3 x4.(on(e1,x4) & n_scooter(x4) & Theme(e2,x4) & v_motorize(e2) & Actor(e1,x1) & v_ride(e1) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists e1 s1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_ride(e1) & n_scooter(x4) & a_blue(s1) & Theme(s1,x4) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1))