A man and a woman are standing on the curb.
Mr. and Mrs. Smith wait to cross the street.
A man and a woman are not necessarily Mr. and Mrs. Smith and standing on a curb doesn't mean they are waiting to cross the street.
exists e1 x1 x2 x3 x4.(n_curb(x4) & on(e1,x4) & Actor(e1,x1) & v_stand(e1) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists p1 x1 x2 x3 x4 x5.(n_street(x5) & a_topic(x1) & Topic(x1,p1) & exists e1.(Theme(e1,x5) & Actor(e1,x1) & v_cross(e1)) & n_wait(x1) & (x1 = x4) & ne_per_smith(x4) & (x1 = x3) & ne_per_mrs.(x3) & (x1 = x2) & ne_org_mr.(x2))