A woman is riding her water bike.
A woman is riding her water bike on water.
A woman riding her water bike is not necessarily doing so on water.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x3) & n_water(x3) & of(x2,x1) & n_female(x1) & n_woman(x1))
exists e1 x1 x2 x3.(on(e1,x3) & n_water(x3) & n_water(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x3) & of(x2,x1) & n_female(x1) & n_woman(x1))