a lady in black washing dishes.
The dishes are white.
Not all dishes are white, and so you can not expect reader to infer these specific dishes are white.
exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_dish(x2) & of(x2,x3) & n_washing(x3) & a_black(s1) & Theme(s1,x2) & n_lady(x1))
exists s1 x1.(n_dish(x1) & Theme(s1,x1) & a_white(s1))