( ( Amino acids ) ( ( contain ( ( ( ( carbon ( , ( hydrogen ( , ( oxygen ( , ( nitrogen , ) ) ) ) ) ) ) and ) sometimes ) sulfur ) ) . ) )
(ROOT (S (NP (NNP Amino) (NNS acids)) (VP (VBP contain) (NP (NP (NN carbon) (, ,) (NN hydrogen) (, ,) (NN oxygen) (, ,) (NN nitrogen) (, ,)) (CC and) (ADVP (RB sometimes)) (NP (NN sulfur)))) (. .)))
Amino acids contain carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur.
(ROOT (S (NP (NNP Rna) (CC and) (NNP dna)) (VP (VBP are) (NP (NP (NNS types)) (PP (IN of) (NP (NP (JJ nucleic) (NNS acids)) (VP (VBG containing) (NP (NP (DT the) (NNS elements)) (NP (NN carbon) (, ,) (NN hydrogen) (, ,) (NN oxygen) (, ,) (NN nitrogen) (, ,) (CC and) (NN phosphorus)))))))) (. .)))