assuming the bar of expectations has n't been raised above sixth-grade height 
(ROOT (S (VP (VBG assuming) (SBAR (S (NP (NP (DT the) (NN bar)) (PP (IN of) (NP (NNS expectations)))) (VP (VBZ has) (RB n't) (VP (VBN been) (VP (VBN raised) (PP (IN above) (NP (NML (JJ sixth) (HYPH -) (NN grade)) (NN height)))))))))))
(ROOT (S (VP (VBG ) (SBAR (S (NP (NP (DT ) (NN )) (PP (IN ) (NP (NNS )))) (VP (VBZ ) (RB ) (VP (VBN ) (VP (VBN ) (PP (IN ) (NP (NML (JJ ) (HYPH ) (NN )) (NN )))))))))))