Go ahead Adam.
( ( ( Go ahead ) Adam ) . )
(ROOT (S (VP (VB Go) (PRT (RP ahead)) (NP (NNP Adam))) (. .)))
Go for it Adam.
( ( Go ( for ( it Adam ) ) ) . )
(ROOT (S (VP (VB Go) (SBAR (IN for) (S (NP (PRP it)) (VP (VBZ Adam))))) (. .)))