( Solids ( ( ( are usually ) crystalline ) . ) )
(ROOT (S (NP (NNS Solids)) (VP (VBP are) (ADVP (RB usually)) (ADJP (JJ crystalline))) (. .)))
Solids are usually crystalline.
(ROOT (S (NP (NP (DT The) (NN majority)) (PP (IN of) (NP (NNS solids)))) (VP (VBP are) (VP (VBG crystalline) (PP (IN in) (NP (NN nature))))) (. .)))