Two friends are walking down the street engaged in a lively conversation.
people are walking
Two friends refers to people
exists e2 e1 s1 x1 x2 x3 x4.(n_street(x2) & down(e1,x2) & in(e2,x4) & n_conversation(x4) & a_lively(s1) & Theme(s1,x4) & Theme(e2,x3) & v_engage(e2) & (x2 = x3) & Actor(e1,x1) & v_walk(e1) & n_friend(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_walk(e1) & n_people(x1))