Person with shovel walks through snowstorm in front of cafe.
Nobody is walking
if a person is walking with a shovel, than some body is walking
exists e1 x1 x2 x3 x4 x5.(ne_nam_person(x1) & in(e1,x4) & of(x4,x5) & n_cafe(x5) & n_front(x4) & through(e1,x3) & n_snowstorm(x3) & Actor(e1,x1) & v_walk(e1) & with(x1,x2) & n_shovel(x2))
-exists e1 x1.(Actor(e1,x1) & v_walk(e1) & n_person(x1))