A man washing his face while taking a shower.
The man is taking a shower.
in a both sentence washing his while and taking a shower is different
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & while(e1,e2) & Theme(e2,x4) & Actor(e2,x2) & v_take(e2) & n_shower(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wash(e1) & n_face(x3) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_shower(x2))