People walking across a red bridge.
People walking through a tunnel.
The people can't be going through a tunnel while on a red bridge.
exists e1 s1 x1 x2 x3.(a_topic(x1) & across(e1,x3) & n_bridge(x3) & a_red(s1) & Theme(s1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3.(a_topic(x1) & through(e1,x3) & n_tunnel(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))