A janitor about to mop in a train station.
A janitor is going to clean the train station
janitor is using using mop to clean the train station
exists p1 s1 x1 x2.(a_topic(x1) & Topic(s1,p1) & Actor(s1,x2) & a_about(s1) & exists e1 x3 x4.(in(e1,x3) & n_station(x3) & of(x3,x4) & n_train(x4) & Actor(e1,x2) & v_mop(e1)) & (x1 = x2) & n_janitor(x1))
exists e1 p1 x1 x2 x3.(n_station(x2) & of(x2,x3) & n_train(x3) & Topic(e1,p1) & Actor(e1,x1) & v_go(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_clean(e2)) & n_janitor(x1))