( ( Water molecules ) ( ( ( ( do not ) naturally ) ( ( stick together ) ( to ( ( form ( the droplets ) ) ( in clouds ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Water) (NNS molecules)) (VP (VBP do) (RB not) (ADVP (RB naturally)) (VP (VB stick) (PRT (RP together)) (S (VP (TO to) (VP (VB form) (NP (DT the) (NNS droplets)) (PP (IN in) (NP (NNS clouds)))))))) (. .)))
Water molecules do not naturally stick together to form the droplets in clouds.
(ROOT (S (NP (NNS Clouds)) (VP (VBP are) (VP (VBN formed) (PP (IN from) (NP (NN water) (NNS droplets))))) (. .)))