( ( The water ) ( ( ( will slowly ) ( ( evaporate , ) ( ( adding humidity ) ( to ( your plants ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN water)) (VP (MD will) (ADVP (RB slowly)) (VP (VB evaporate) (, ,) (S (VP (VBG adding) (NP (NN humidity)) (PP (TO to) (NP (PRP$ your) (NNS plants))))))) (. .)))
The water will slowly evaporate, adding humidity to your plants.
(ROOT (S (NP (NNP Humidity) (NNP happens)) (VP (VBZ happens) (SBAR (WHADVP (WRB when)) (S (NP (JJ liquid) (NN water)) (VP (VBZ evaporates))))) (. .)))