( ( ( The ( three ( ( most ( commonly used ) ) scales ) ) ) ( of temperature ) ) ( ( are ( the ( Fahrenheit ( , ( Celsius ( and ( Kelvin scales ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (CD three) (ADJP (RBS most) (RB commonly) (VBN used)) (NNS scales)) (PP (IN of) (NP (NN temperature)))) (VP (VBP are) (NP (DT the) (NN Fahrenheit) (, ,) (NNP Celsius) (CC and) (NNP Kelvin) (NNS scales))) (. .)))
The three most commonly used scales of temperature are the Fahrenheit, Celsius and Kelvin scales.
(ROOT (S (NP (DT The) (JJ kelvin) (NN scale) (NN temperature) (NN scale)) (VP (VBZ is) (ADVP (RB commonly)) (VP (VBN used) (PP (IN in) (NP (NN science))))) (. .)))