A man and a woman are smiling for the camera but the woman is not looking at the camera.
A couple is smiling for the camera.
A man and a woman smiling for a camera do not have to be a couple.
exists e1 x1 x2 x3 x4 x5 x6.(n_camera(x6) & n_camera(x6) & -exists e2.(at(e2,x6) & Actor(e2,x1) & v_look(e2)) & subset_of(x3,x1) & for(e1,x5) & subset_of(x3,x5) & n_woman(x3) & n_woman(x3) & subset_of(x6,x5) & Actor(e1,x4) & v_smile(e1) & (x3 = x4) & subset_of(x2,x1) & n_man(x2))
exists e1 x1 x2.(n_camera(x2) & for(e1,x2) & Actor(e1,x1) & v_smile(e1) & n_couple(x1))