A person is riding a surfboard on a wave.
A person is riding a surfboard has decided to take a nap.
Is the person on a wave or is the person taking a nap
exists e1 x1 x2 x3.(on(e1,x3) & n_wave(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_surfboard(x2) & n_person(x1))
exists e1 e2 p1 x1 x2 x3.(Topic(e2,p1) & Actor(e2,x1) & v_decide(e2) & exists e3 x4.(Theme(e3,x4) & Actor(e3,x1) & v_take(e3) & n_nap(x4)) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_surfboard(x3) & (x1 = x2) & n_person(x1))