A walk on the beach after a storm.
The sand is white
The color of the sand is not stated. One cannot assume that it is white.
exists x1 x2 x3.(n_beach(x2) & a_topic(x1) & on(x1,x2) & after(x2,x3) & n_storm(x3) & n_walk(x1))
exists s1 x1.(n_sand(x1) & Theme(s1,x1) & a_white(s1))