A man walking a gray poodle is walking past a billboard with a cow on it.
Nobody is walking
Sentence one discussed a man walking a gray poodle. Sentence two states that nobody is walking.
exists e2 e1 s1 x1 x2 x3 x4 x5.(with(e2,x5) & on(x5,x1) & n_thing(x1) & n_cow(x5) & past(e2,x4) & n_billboard(x4) & Actor(e2,x1) & v_walk(e2) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & n_poodle(x3) & a_gray(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
-exists e1 x1.(Actor(e1,x1) & v_walk(e1) & n_person(x1))