A person rides a bike down a rocky hill.
A cyclist is riding down a hill.
a person who rides a bike is called a cyclist
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 s1 x1 x2.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_hill(x2) & n_cyclist(x1))