Perhaps we should prepare a militia.
( Perhaps ( we ( ( should ( prepare ( a militia ) ) ) . ) ) )
(ROOT (S (ADVP (RB Perhaps)) (NP (PRP we)) (VP (MD should) (VP (VB prepare) (NP (DT a) (NN militia)))) (. .)))
We should prepare a militia to fight off the demons.
( We ( ( should ( prepare ( a ( militia ( to ( ( fight off ) ( the demons ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (MD should) (VP (VB prepare) (NP (DT a) (NN militia) (S (VP (TO to) (VP (VB fight) (PRT (RP off)) (NP (DT the) (NNS demons)))))))) (. .)))