There's one thing, he thought to himself, "they can't go on shooting.
( ( There ( 's ( one thing ) ) ) ( , ( he ( ( ( ( ( thought ( to himself ) ) , ) `` ) ( they ( ( ca n't ) ( go ( on shooting ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (EX There)) (VP (VBZ 's) (NP (CD one) (NN thing)))) (, ,) (NP (PRP he)) (VP (VBD thought) (PP (TO to) (NP (PRP himself))) (, ,) (`` ``) (S (NP (PRP they)) (VP (MD ca) (RB n't) (VP (VB go) (PP (IN on) (NP (NN shooting))))))) (. .)))
He thought that they couldn't go on shooting.
( He ( ( thought ( that ( they ( ( could n't ) ( go ( on shooting ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD thought) (SBAR (IN that) (S (NP (PRP they)) (VP (MD could) (RB n't) (VP (VB go) (PP (IN on) (NP (NN shooting)))))))) (. .)))