A man wearing a white cap is taking a photo
A man takes a photo for a friend
Man taking a photo does not imply he is taking photo for his friend.
exists e1 e2 s1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_take(e2) & n_photo(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_cap(x3) & a_white(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & for(x2,x3) & n_friend(x3) & n_photo(x2) & n_man(x1))