A traveler on a snowy road
This person keeps warm by a fire.
A person traveling is not sitting by a fire.
exists s1 x1 x2.(a_topic(x1) & on(x1,x2) & n_road(x2) & a_snowy(s1) & Theme(s1,x2) & n_traveler(x1))
exists e1 p1 x1 x2.(n_person(x1) & by(e1,x2) & n_fire(x2) & exists s1.(Theme(s1,x1) & a_warm(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_keep(e1))