A girl rides a bike down a city sidewalk.
There is a girl riding a bike.
Girl rides a bike is a rephrasing of girl riding a bike.
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & down(x2,x3) & n_sidewalk(x3) & of(x3,x4) & n_city(x4) & n_bike(x2) & n_girl(x1))
exists p1 x1 e1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bike(x4) & (x2 = x3) & n_girl(x2))