Person kayaking in white water.
A person attempts some whitewater.
A person kayaking is someone who attempts whitewater.
exists e1 s1 x1 x2.(ne_nam_person(x1) & in(e1,x2) & n_water(x2) & a_white(s1) & Theme(s1,x2) & Actor(e1,x1) & v_kayake(e1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_attempt(e1) & n_whitewater(x2) & n_person(x1))