A couple having a conversation.
A man and his wife talking.
Not every couple is man and wife.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & n_conversation(x3) & (x1 = x2) & n_couple(x1))
exists e1 s1 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & Actor(e1,x3) & v_talking(e1) & (x2 = x3) & n_wife(x2) & of(x2,x1) & n_male(x1) & subset_of(x1,s1) & n_man(x1))