( ( ( a. Types ) ( of ( galaxies ( There ( are ( ( three ( major classes ) ) ( of galaxies ) ) ) ) ) ) ) ; )
(ROOT (NP (NP (NP (NNP a.) (NNP Types)) (PP (IN of) (NP (NP (NNS galaxies)) (SBAR (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (JJ major) (NNS classes)) (PP (IN of) (NP (NNS galaxies)))))))))) (: ;)))
a. Types of galaxies There are three major classes of galaxies;
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS types)) (PP (IN of) (NP (NNS galaxies))))) (. .)))