Man taking a walk by himself.
The man is talking with his friend.
One can be either by himself or with one's friend.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_take(e1) & by(x3,x1) & n_male(x1) & n_walk(x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_friend(x2) & of(x2,x1) & n_male(x1) & n_man(x1) & with(e1,x2) & Actor(e1,x1) & v_talk(e1))