( ( Many droplets ) ( ( form ( a cloud ) ) . ) )
(ROOT (S (NP (JJ Many) (NNS droplets)) (VP (VBP form) (NP (DT a) (NN cloud))) (. .)))
Many droplets form a cloud.
(ROOT (S (NP (NNS Clouds)) (VP (VBP are) (VP (VBN formed) (PP (IN from) (NP (NN water) (NNS droplets))))) (. .)))