Kill chickens.
( ( Kill chickens ) . )
(ROOT (S (VP (VB Kill) (NP (NNS chickens))) (. .)))
Do not touch the chickens.
( ( ( Do not ) ( touch ( the chickens ) ) ) . )
(ROOT (S (VP (VB Do) (RB not) (VP (VB touch) (NP (DT the) (NNS chickens)))) (. .)))