Two people are having a conversation, while sitting on a curb.
People having conversation on a curb.
only two people having conversation
exists e1 e2 x1 x2 x3.(while(e1,e2) & on(e2,x3) & n_curb(x3) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_conversation(x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_curb(x4) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & n_conversation(x3) & (x1 = x2) & n_people(x1))