A group of people are going down an escalator.
A group of people are in an elevator.
People on an elevator are not also on an escalator.
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_go(e1) & n_escalator(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 x1 x2.(exists x3.(in(x1,x3) & n_elevator(x3)) & of(x1,x2) & n_people(x2) & n_group(x1))