( ( A ( paper bag ) ) ( ( can ( be ( used ( to ( conserve water ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN paper) (NN bag)) (VP (MD can) (VP (VB be) (VP (VBN used) (S (VP (TO to) (VP (VB conserve) (NP (NN water)))))))) (. .)))
A paper bag can be used to conserve water.
(ROOT (S (NP (DT The) (JJS best) (NN way) (NNS humans)) (VP (MD can) (VP (VB conserve) (SBAR (S (NP (NN water)) (VP (VBZ is) (S (VP (TO to) (VP (VB use) (NP (JJR less)))))))))) (. .)))