A couple is sharing an embrace and a smile.
dog chasing frog
The primary subject can be both about a couple and also a dog and frog.
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_share(e1) & subset_of(x4,x2) & n_smile(x4) & subset_of(x3,x2) & n_embrace(x3) & n_couple(x1))
exists x1 x2 x3.(n_frog(x1) & of(x1,x3) & n_chasing(x3) & of(x1,x2) & n_dog(x2) & a_topic(x1))