People standing in line at a food service place.
People are standing in line.
The second sentence is less specific about where the people were standing, but they are standing in both.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & at(e1,x4) & n_place(x4) & of(x4,x6) & n_service(x6) & of(x4,x5) & n_food(x5) & in(e1,x3) & n_line(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(in(e1,x2) & n_line(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1))