A dig is trekking through snow.
A yellow dog walking through the snow.
The dog may not be yellow.
exists e1 x1 x2.(through(e1,x2) & n_snow(x2) & Actor(e1,x1) & v_trek(e1) & n_dig(x1))
exists e1 s1 x1 x2 x3.(n_snow(x3) & a_topic(x1) & through(e1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_dog(x1) & a_yellow(s1) & Theme(s1,x1))