A black dog is completely off the ground while in a race.
a dog in a race for the first time
It's not necessarily the first time the dog is in a race.
exists p1 s1 x1 x2 x3.(n_ground(x3) & in(p1,x2) & n_race(x2) & r_while(p1) & r_completely(x1) & off(x1,x3) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists s1 x1 x2 x3.(n_time(x3) & a_first(s1) & Theme(s1,x3) & a_topic(x1) & in(x1,x2) & for(x2,x3) & n_race(x2) & n_dog(x1))