( ( Comets tails ) ( ( are ( made ( of ( dust ( and ( ice particles ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Comets) (NNS tails)) (VP (VBP are) (VP (VBN made) (PP (IN of) (NP (NN dust) (CC and) (NN ice) (NNS particles))))) (. .)))
Comets tails are made of dust and ice particles.
(ROOT (S (NP (JJ Comet) (NNS tails)) (VP (ADVP (RB always)) (VBP point) (PRT (RP away)) (PP (IN from) (NP (NP (DT the) (NN sun)) (PP (RB instead) (IN of) (S (VP (VBG trailing) (PP (IN behind) (NP (DT the) (ADJP (JJ comet) (PP (IN because) (NP (NN dust) (NNS particles)))) (NN recoil))))))))) (. .)))