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