People walking in a long hallway.
People are walking in a long hallway with blue walls.
People walking in a hallway, the walls don't have to be blue.
exists e1 s1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_hallway(x3) & a_long(s1) & Theme(s1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists e1 s1 s2 x1 x2 x3.(with(e1,x3) & n_wall(x3) & a_blue(s2) & Theme(s2,x3) & in(e1,x2) & n_hallway(x2) & a_long(s1) & Theme(s1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))