A guy vacuuming his room.
The man is vacuuming.
Guy is a synonym for man.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_vacuum(e1) & n_room(x3) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_guy(x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_vacuum(e1))