( ( ( The speed ) ( of ( the wave ) ) ) ( ( is ( equal ( to ( ( the wavelength ) ( times ( the frequency ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN speed)) (PP (IN of) (NP (DT the) (NN wave)))) (VP (VBZ is) (ADJP (JJ equal) (PP (TO to) (NP (NP (DT the) (NN wavelength)) (PP (CC times) (NP (DT the) (NN frequency))))))) (. .)))
The speed of the wave is equal to the wavelength times the frequency.
(ROOT (S (NP (NP (DT The) (NN product)) (PP (IN of) (NP (NP (NP (DT a) (NN wave) (POS 's)) (NN wavelength)) (CC and) (NP (PRP$ its) (NN frequency))))) (VP (VBZ is) (NP (PRP$ its) (NN speed))) (. .)))