Cyclist speeding down the trail.
The cyclist is riding a bike.
To be speeding down is to be riding.
exists x1 x2 x3.(n_trail(x3) & a_topic(x1) & down(x1,x3) & n_speeding(x1) & of(x1,x2) & n_cyclist(x2))
exists e1 x1 x2.(n_cyclist(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2))