A young man walking down the street.
A man is taking a walk.
In order for a man to be walking down the street, he would have to be taking a walk.
exists e1 s1 x1 x2 x3.(n_street(x3) & a_topic(x1) & down(e1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_walk(x2) & n_man(x1))