A man and women shake hands as a bride holding a flower bouquet looks on.
the people are a couple
Just because a man and a woman shake hands doesn't imply that they are couple.
exists e1 p1 x1 x2 x3 x4.(exists e2 e3 s1 x5 x6 x7 x8.(a_on(s1) & Manner(e3,s1) & Actor(e3,x5) & v_look(e3) & Theme(e2,x7) & Actor(e2,x6) & v_hold(e2) & n_bouquet(x7) & of(x7,x8) & n_flower(x8) & (x5 = x6) & n_bride(x5)) & as(e1,p1) & Theme(e1,x4) & Actor(e1,x1) & v_shake(e1) & n_hand(x4) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists p1 x1.(n_people(x1) & exists x2.((x1 = x2) & n_couple(x2)))