( ( When ( ( these strings ) vibrate ) ) ( , ( they ( ( ( make ( the ( different particles ) ) ) ( that ( ( ( we ( know ( to ( be quarks ) ) ) ) and ) ( eventually ( they ( become ( particles ( like ( ( protons and ) neutrons ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT these) (NNS strings)) (VP (VBP vibrate)))) (, ,) (NP (PRP they)) (VP (VBP make) (NP (DT the) (JJ different) (NNS particles)) (SBAR (IN that) (S (S (NP (PRP we)) (VP (VBP know) (S (VP (TO to) (VP (VB be) (ADJP (JJ quarks))))))) (CC and) (S (ADVP (RB eventually)) (NP (PRP they)) (VP (VBP become) (NP (NP (NNS particles)) (PP (IN like) (NP (NNS protons) (CC and) (NNS neutrons))))))))) (. .)))
When these strings vibrate, they make the different particles that we know to be quarks and eventually they become particles like protons and neutrons.
(ROOT (S (NP (NNS Protons) (CC and) (NNS neutrons)) (VP (VBP are) (VP (VBN made) (PP (IN of) (NP (NP (NNS quarks)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (NP (NP (JJ fundamental) (NNS particles)) (PP (IN of) (NP (NN matter))))))))))) (. .)))