( ( The ( dust tail ) ) ( typically ( just ( ( trails ( behind ( the comet ) ) ) . ) ) ) )
(ROOT (S (NP (DT The) (NN dust) (NN tail)) (ADVP (RB typically)) (ADVP (RB just)) (VP (VBZ trails) (PP (IN behind) (NP (DT the) (NN comet)))) (. .)))
The dust tail typically just trails behind the comet.
(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))))))))) (. .)))