A couple having a conversation over drinks.
A man is walking down the street.
There is either a couple having a conversation or a man walking down the street.
exists e1 x1 x2 x3 x4.(a_topic(x1) & over(e1,x4) & n_drink(x4) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & n_conversation(x3) & (x1 = x2) & n_couple(x1))
exists e1 s1 x1 x2.(n_street(x2) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))