Two people sit on a brick wall and talk.
People having a conversation.
YOU TALK WHEN YOU HAVE A CONVERSATION.
exists e1 x1 x2 x3 x4 x5.(on(e1,x2) & n_talk(x4) & n_wall(x3) & of(x3,x5) & n_brick(x5) & subset_of(x4,x2) & subset_of(x3,x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & n_conversation(x3) & (x1 = x2) & n_people(x1))