There is a truck on fire.
A truck being cleaned by people.
A truck cannot be on fire while it is being cleaned.
exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_fire(x3) & n_truck(x2))
exists e1 x1 x2 x3.(a_topic(x1) & Actor(e1,x3) & n_people(x3) & Theme(e1,x2) & v_clean(e1) & (x1 = x2) & n_truck(x1))