( Classes ( ( ( ( ( ( ( ( ( ( set up ) ( weather ( observation stations ) ) ) and ) ( take ( daily ( temperature readings ) ) ) ) , ) ( note ( sky conditions ) ) ) , ) and ) ( cloud formations ) ) . ) )
(ROOT (S (NP (NNS Classes)) (VP (VP (VBD set) (PRT (RP up)) (NP (NN weather) (NN observation) (NNS stations))) (CC and) (VP (VB take) (NP (JJ daily) (NN temperature) (NNS readings))) (, ,) (VP (NN note) (NP (NN sky) (NNS conditions))) (, ,) (CC and) (VP (VBP cloud) (NP (NNS formations)))) (. .)))
Classes set up weather observation stations and take daily temperature readings, note sky conditions, and cloud formations.
(ROOT (S (NP (NN Temperature) (CC and) (NN sky) (NNS conditions)) (VP (VBP are) (ADVP (DT both)) (VP (VBN used) (S (VP (TO to) (VP (VB describe) (NP (NN weather))))))) (. .)))