People walks on a city sidewalk.
A group of friends goes for a stroll
It doesnt say if the people walking are friends or not. walking is not the same as having a stroll.
exists e1 x1 x2 x3.(on(e1,x2) & n_sidewalk(x2) & of(x2,x3) & n_city(x3) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2 x3.(for(e1,x3) & n_stroll(x3) & Actor(e1,x1) & v_go(e1) & of(x1,x2) & n_friend(x2) & n_group(x1))