A biker is racing to keep up with the runners
A person is sitting on a couch.
One cannot be sitting and racing simultaneously.
exists e1 p1 x1 x2.(n_runner(x2) & Topic(e1,p1) & Actor(e1,x1) & v_race(e1) & exists e2 s1.(a_up(s1) & Manner(e2,s1) & with(e2,x2) & Actor(e2,x1) & v_keep(e2)) & n_biker(x1))
exists e1 x1 x2.(on(e1,x2) & n_couch(x2) & Actor(e1,x1) & v_sit(e1) & n_person(x1))