Shall we finish it off?
( ( Shall ( we ( ( finish it ) off ) ) ) ? )
(ROOT (SQ (VP (VB Shall) (S (NP (PRP we)) (VP (VB finish) (NP (PRP it)) (PRT (RP off))))) (. ?)))
It is important that we finish this.  
( It ( ( ( is important ) ( that ( we ( finish this ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (JJ important)) (SBAR (IN that) (S (NP (PRP we)) (VP (VBP finish) (NP (DT this)))))) (. .)))