a dog runs across the snow.
A dog is looking for its toy in the snow.
Sentence 1 is missing looking for its toy
exists e1 x1 x2.(n_snow(x2) & across(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2 x3.(n_snow(x3) & for(e1,x2) & in(x2,x3) & n_toy(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_look(e1) & n_dog(x1))