( Carbon ( ( can ( ( ( ( form ( stable ( covalent bonds ) ) ) ( with ( ( a number ) ( of elements ) ) ) ) , ) ( generating ( ( a ( vast number ) ) ( of ( ( different kinds ) ( of molecules ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Carbon)) (VP (MD can) (VP (VB form) (NP (JJ stable) (NN covalent) (NNS bonds)) (PP (IN with) (NP (NP (DT a) (NN number)) (PP (IN of) (NP (NNS elements))))) (, ,) (S (VP (VBG generating) (NP (NP (DT a) (JJ vast) (NN number)) (PP (IN of) (NP (NP (JJ different) (NNS kinds)) (PP (IN of) (NP (NNS molecules)))))))))) (. .)))
Carbon can form stable covalent bonds with a number of elements, generating a vast number of different kinds of molecules .
(ROOT (S (SBAR (IN Although) (S (NP (PRP they)) (VP (VBP differ) (ADVP (RB vastly)) (PP (IN in) (NP (NNS hardness)))))) (, ,) (NP (NP (NN pencil) (NN lead)) (CC and) (NP (NNS diamonds))) (DT both) (VP (VBP contain) (NP (NN carbon))) (. .)))