( ( The stems ) ( ( help ( ( the plant ) ( stay upright ) ) ) . ) )
(ROOT (S (NP (DT The) (NN stems)) (VP (VBP help) (S (NP (DT the) (NN plant)) (VP (VB stay) (NP (NN upright))))) (. .)))
The stems help the plant stay upright.
(ROOT (S (NP (DT The) (NN stem)) (VP (VBZ is) (NP (NP (DT the) (JJ basic) (NN structure)) (SBAR (WHNP (WDT that)) (S (VP (VBZ holds) (S (NP (NNS plants)) (ADJP (JJ upright))) (, ,) (S (VP (VBG allowing) (NP (NNS plants)) (S (VP (TO to) (VP (VB get) (NP (NP (DT the) (NN sunlight) (CC and) (NN air)) (SBAR (S (NP (PRP they)) (VP (VBP need))))))))))))))) (. .)))