( You ( ( ( do n't ) ( need ( to ( water ( if ( ( the soil ) ( ( is still ) moist ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (VBP do) (RB n't) (VP (VB need) (S (VP (TO to) (VP (VB water) (SBAR (IN if) (S (NP (DT the) (NN soil)) (VP (VBZ is) (ADVP (RB still)) (ADJP (JJ moist)))))))))) (. .)))
You don't need to water if the soil is still moist.
(ROOT (S (NP (NNP Water) (NNS molds)) (ADVP (RB mostly)) (VP (VBP live) (PP (IN in) (NP (NN water) (CC or) (NN moist) (NN soil)))) (. .)))