an old lady walks down the street.
A old lady is skiing fast down the street.
She who walks cannot be skiing at the same time.
exists e1 s1 x1 x2.(n_street(x2) & down(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_lady(x1) & a_old(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2.(n_street(x2) & a_fast(s2) & Manner(e1,s2) & down(e1,x2) & Actor(e1,x1) & v_ski(e1) & n_lady(x1) & a_old(s1) & Theme(s1,x1))