( ( The ( ( ( strong and ) weak ) forces ) ) ( ( are ( ( nuclear forces ) ( that ( ( ( ( ( act only ) ( at ( ( very short ) distances ) ) ) , ) and ) ( are ( responsible ( for ( ( ( ( the interactions ) ( between ( subatomic particles ) ) ) , ) ( including ( ( nucleons and ) ( compound nuclei ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (ADJP (JJ strong) (CC and) (JJ weak)) (NNS forces)) (VP (VBP are) (NP (NP (JJ nuclear) (NNS forces)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP act) (ADVP (RB only)) (PP (IN at) (NP (ADJP (RB very) (JJ short)) (NNS distances)))) (, ,) (CC and) (VP (VBP are) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NNS interactions)) (PP (IN between) (NP (JJ subatomic) (NNS particles))) (, ,) (PP (VBG including) (NP (NP (NNS nucleons)) (CC and) (NP (JJ compound) (NNS nuclei))))))))))))) (. .)))
The strong and weak forces are nuclear forces that act only at very short distances, and are responsible for the interactions between subatomic particles, including nucleons and compound nuclei.
(ROOT (S (NP (NP (DT The) (JJ subatomic) (NNS particles)) (PP (IN of) (NP (DT the) (NN nucleus)))) (VP (VBP are) (VP (VBN called) (NP (NNS nucleons)))) (. .)))