So would a society.
( So ( ( would ( a society ) ) . ) )
(ROOT (SINV (ADVP (RB So)) (VP (MD would)) (NP (DT a) (NN society)) (. .)))
A society would not.
( ( A society ) ( ( would not ) . ) )
(ROOT (S (NP (DT A) (NN society)) (VP (MD would) (RB not)) (. .)))