'Go now.'
( ` ( ( ( Go now ) . ) ' ) )
(ROOT (S (`` `) (VP (VB Go) (ADVP (RB now))) (. .) ('' ')))
Go on and kill. 
( ( ( ( Go on ) and ) kill ) . )
(ROOT (S (VP (VP (VB Go) (PRT (RP on))) (CC and) (VP (VB kill))) (. .)))