A couple having a conversation.
A couple is talking.
A conversation  means talking.
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 x1.(Actor(e1,x1) & v_talk(e1) & n_couple(x1))