( ( ( Water ( vapor condenses ) ) ( around ( these ( ( particles and ) clouds ) ) ) ) ( ( are formed ) . ) )
(ROOT (S (NP (NP (NNP Water) (NN vapor) (NNS condenses)) (PP (IN around) (NP (DT these) (NNS particles) (CC and) (NNS clouds)))) (VP (VBP are) (VP (VBN formed))) (. .)))
Water vapor condenses around these particles and clouds are formed.
(ROOT (S (NP (NNP Water) (NN vapor)) (VP (MD must) (VP (VB lose) (NP (NN heat) (NN energy)) (SBAR (IN before) (S (NP (NNS clouds)) (VP (MD can) (VP (VB form))))))) (. .)))
Water vapor must lose heat energy before clouds can form.