A girl drinking a soda while another plays Wii while sitting on couches.
A girl and her friend are outside walking the dog.
A girl's friend is not necessarily another girl. One cannot be sitting on a couch at the same time one is walking a dog.
exists e1 p1 x1 x2 x3 x5.(ne_geo_wii(x5) & a_topic(x1) & exists e2 e3 x4 x6.(while(e2,e3) & on(e3,x6) & n_couch(x6) & Actor(e3,x4) & v_sit(e3) & Theme(e2,x5) & Actor(e2,x4) & v_play(e2) & n_thing(x4)) & while(e1,p1) & Theme(e1,x3) & Actor(e1,x2) & v_drink(e1) & n_soda(x3) & (x1 = x2) & n_girl(x1))
exists e1 s1 x1 x2 x3 x4.(n_dog(x4) & for(s1,e1) & Theme(e1,x4) & Actor(e1,x1) & v_walk(e1) & Theme(s1,x1) & a_outside(s1) & subset_of(x3,x1) & n_friend(x3) & of(x3,x2) & n_female(x2) & subset_of(x2,x1) & n_girl(x2))