People walking in a supermarket.
Humans walking
People are humans.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_supermarket(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists x1 x2.(n_walking(x1) & (x1 = x2) & ne_nam_humans(x2) & a_topic(x1))