Two guys talking in front of a sink.
Two people are talking to eachother.
Two people are talking to each other, and they are in front of a sink, therefore they must be in front of a sink.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & of(x3,x4) & n_sink(x4) & n_front(x3) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_guy(x1) & card_eq_2(x1))
exists e1 x1 x2.(to(e1,x2) & n_eachother(x2) & Actor(e1,x1) & v_talk(e1) & n_people(x1) & card_eq_2(x1))