( ( ( ( Tails and ) trails ) ( The ( large particles ) ) ) ( ( remain ( ( ( close ( to ( the comet ) ) ) and ) ( form ( a ( dust coma ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Tails) (CC and) (NNS trails)) (NP (DT The) (JJ large) (NNS particles))) (VP (VBP remain) (VP (VP (VB close) (PP (TO to) (NP (DT the) (NN comet)))) (CC and) (VP (VB form) (NP (DT a) (NN dust) (NN coma))))) (. .)))
Tails and trails The large particles remain close to the comet and form a dust coma.
(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))))))))) (. .)))