( ( A ___ ) ( ( is ( ( formed ( by ( ( the condensation ) ( of ( water vapor ) ) ) ) ) ( in ( cold air ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN ___)) (VP (VBZ is) (VP (VBN formed) (PP (IN by) (NP (NP (DT the) (NN condensation)) (PP (IN of) (NP (NN water) (NN vapor))))) (PP (IN in) (NP (JJ cold) (NN air))))) (. .)))
A ___ is formed by the condensation of water vapor in cold air.
(ROOT (S (NP (NP (NNP Dew)) (VP (VBG forming) (PP (IN on) (NP (NNS plants))) (PP (IN during) (NP (DT a) (JJ cold) (NN night))))) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NN water) (NN condensing))))) (. .)))