A person rides a bike down a rocky hill.
The person riding the bike down the hill is a man.
Not every bike rider is a man.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & down(x2,x3) & n_hill(x3) & a_rocky(s1) & Theme(s1,x3) & n_bike(x2) & n_person(x1))
exists e1 p1 x1 x2 x3 x4.(n_hill(x4) & n_bike(x3) & n_person(x1) & exists x5.((x1 = x5) & n_man(x5)) & down(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & (x1 = x2))