Dirt biker makes a sloping turn in a forest during the fall.
Nobody has a bike.
Dirt biker has to have a bike in order to ride it.
exists e1 x1 x2 x3 x4 x5 x6.(n_fall(x6) & during(e1,x6) & Theme(e1,x3) & Actor(e1,x1) & v_make(e1) & in(x3,x5) & n_forest(x5) & n_turn(x3) & of(x3,x4) & n_sloping(x4) & n_biker(x1) & (x1 = x2) & ne_nam_dirt(x2))
-exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_bike(x2) & n_person(x1))