People talking as they walk on cellphones outside by a green wall.
The people near the wall were smiling.
People don't have to be smiling while talking on cellphones.
exists e1 e2 s1 s2 x1 x2 x3 x4.(by(e2,x4) & n_wall(x4) & a_green(s2) & Theme(s2,x4) & a_outside(s1) & Manner(e2,s1) & on(e2,x3) & n_cellphone(x3) & Actor(e2,x1) & v_walk(e2) & as(e1,x1) & n_thing(x1) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(n_wall(x2) & n_people(x1) & Actor(e1,x1) & v_smile(e1) & near(x1,x2))