Two people walking down some stairs.
Two people are walking.
People are walking down the stairs therefore they are walking
exists e1 s1 x1 x2 x3.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & n_stair(x3) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_walk(e1) & n_people(x1) & card_eq_2(x1))