A half naked women is riding a bike.
A person is on a bike.
The woman is riding a bike, meaning there is a person on the bike.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_bike(x3) & n_woman(x1) & a_naked(s1) & Theme(s1,x1) & of(x1,x2) & n_half(x2))
exists p1 x1.(exists x2.(on(x1,x2) & n_bike(x2)) & n_person(x1))