( Condensation ( , ( ( forming clouds ) . ) ) )
(ROOT (FRAG (ADJP (JJ Condensation)) (, ,) (VP (VBG forming) (NP (NNS clouds))) (. .)))
Condensation, forming clouds.
(ROOT (S (NP (NNP Condensation)) (VP (MD must) (VP (VB occur) (PP (IN for) (NP (NNS clouds))) (S (VP (TO to) (VP (VB form)))))) (. .)))