Shoppers walking across the street in a city.
Pedestrians are crossing the street.
Shoppers are walking means they are pedestrians on the street.
exists e1 x1 x2 x3 x4.(n_street(x3) & a_topic(x1) & in(e1,x4) & n_city(x4) & across(e1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_shopper(x1))
exists e1 x1 x2.(n_street(x2) & Theme(e1,x2) & Actor(e1,x1) & v_cross(e1) & n_pedestrian(x1))