A woman riding a bicycle.
The woman is on a bike.
One has to be on a bike in order to ride it.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bicycle(x3) & (x1 = x2) & n_woman(x1))
exists p1 x1.(n_woman(x1) & exists x2.(on(x1,x2) & n_bike(x2)))