A young woman in jeans walking past graffiti.
A man painting over some grafitti.
A man is not a woman.  One cannot be painting and walking past at the same time.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_walk(e1) & n_graffitus(x4) & a_past(s2) & Theme(s2,x4) & (x2 = x3) & n_jeans(x2) & n_woman(x1) & a_young(s1) & Theme(s1,x1))
exists x1 x2 x3.(a_topic(x1) & over(x1,x3) & n_grafittus(x3) & n_painting(x1) & of(x1,x2) & n_man(x2))