( ( ( ( ( ( The ( waters surface ) ) ( was ( mirror smooth ) ) ) , ) but ) ( ( the ( UGF flow ) ) ( ( was not ) impacted ) ) ) . )
(ROOT (S (S (NP (DT The) (NNS waters) (NN surface)) (VP (VBD was) (ADJP (RB mirror) (JJ smooth)))) (, ,) (CC but) (S (NP (DT the) (NNP UGF) (NN flow)) (VP (VBD was) (RB not) (VP (VBN impacted)))) (. .)))
The waters surface was mirror smooth, but the UGF flow was not impacted.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT the) (NN water)) (VP (VBP vapor) (PP (IN from) (NP (DT a) (JJ hot) (NN shower) (NNS contacts))) (NP (NP (DT the) (JJR cooler) (NN surface)) (PP (IN of) (NP (DT a) (NN mirror))))))) (, ,) (NP (DT the) (NN result)) (VP (VBZ is) (SBAR (IN that) (S (NP (NNP foggy)) (VP (VBP mirror))))) (. .)))