He said the President signed off on that concept.
( He ( ( said ( ( the President ) ( ( signed off ) ( on ( that concept ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD said) (SBAR (S (NP (DT the) (NNP President)) (VP (VBD signed) (PRT (RP off)) (PP (IN on) (NP (DT that) (NN concept))))))) (. .)))
The concept hadn't been presented to the President yet.
( ( The concept ) ( ( ( had n't ) ( been ( ( presented ( to ( the President ) ) ) yet ) ) ) . ) )
(ROOT (S (NP (DT The) (NN concept)) (VP (VBD had) (RB n't) (VP (VBN been) (VP (VBN presented) (PP (TO to) (NP (DT the) (NNP President))) (ADVP (RB yet))))) (. .)))