People are walking down the street and a child is sitting on the curb.
The child is sitting down.
If a child is sitting on the curb, the child would be sitting down.
exists e1 e2 x1 x2 x3 x4.(n_curb(x4) & n_street(x2) & on(e2,x4) & Actor(e2,x3) & v_sit(e2) & n_child(x3) & down(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 s1 x1.(n_child(x1) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1))