Two happy people pose for a photo.
a cellphone falls to the floor
A cell phone does not fall while posing for a photo.
exists e1 s1 x1 x2.(for(e1,x2) & n_photo(x2) & Actor(e1,x1) & v_pose(e1) & n_people(x1) & a_happy(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2.(n_floor(x2) & to(e1,x2) & Actor(e1,x1) & v_fall(e1) & n_cellphone(x1))