People standing on a very crowded bus.
There are a lot of people on a bus.
"people on a bus" is a simpler version of " standing on a very crowded bus".
exists e1 s1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_bus(x3) & a_crowded(s1) & Theme(s1,x3) & r_very(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1))
exists p1 x1 x2 x3 x4.((x1 = x2) & of(x2,x3) & on(x3,x4) & n_bus(x4) & n_people(x3) & n_lot(x2))