( ( This theory ) ( ( holds ( that ( there ( are ( ( ( ( ( six quarks ) , ) ( grouped ( into ( three ( distinct pairs ) ) ) ) ) , ) ( that ( combine ( to ( form ( ( larger particles ) ( such ( as ( ( the ( ( protons and ) neutrons ) ) ( in ( ( the nuclei ) ( of atoms ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN theory)) (VP (VBZ holds) (SBAR (IN that) (S (NP (EX there)) (VP (VBP are) (NP (NP (CD six) (NNS quarks)) (, ,) (VP (VBN grouped) (PP (IN into) (NP (CD three) (JJ distinct) (NNS pairs)))) (, ,) (SBAR (WHNP (WDT that)) (S (VP (VBP combine) (S (VP (TO to) (VP (VB form) (NP (NP (JJR larger) (NNS particles)) (PP (JJ such) (IN as) (NP (NP (DT the) (NNS protons) (CC and) (NNS neutrons)) (PP (IN in) (NP (NP (DT the) (NN nuclei)) (PP (IN of) (NP (NNS atoms))))))))))))))))))) (. .)))
This theory holds that there are six quarks, grouped into three distinct pairs, that combine to form larger particles such as the protons and neutrons in the nuclei of atoms.
(ROOT (S (NP (NNP Carbon) (NNS atoms)) (VP (VBP have) (NP (NP (CD six) (NNS neutrons)) (CONJP (RB as) (RB well) (IN as)) (NP (CD six) (NNS protons)))) (. .)))