( ( Describe ( ( the ( crystal structure ) ) ( of diamond ) ) ) . )
(ROOT (S (VP (VB Describe) (NP (NP (DT the) (NN crystal) (NN structure)) (PP (IN of) (NP (NN diamond))))) (. .)))
Describe the crystal structure of diamond.
(ROOT (S (NP (DT A) (NN mineral)) (VP (VBZ is) (VP (VBN described) (PP (IN as) (NP (NP (DT a) (JJ solid) (JJ natural) (NN material)) (PP (IN with) (NP (DT a) (NN crystal) (NN structure))))))) (. .)))