(S (S (BASENP (DT The) (NN boy)) (VP (VP (VP (VBD held) (BASENP (DT the) (NN rifle))) (PP (IN at) (NP (BASENP (DT the) (NN butt)) (PP (IN in) (BASENP (PRPD his) (JJ right) (NN arm)))))) (PP (IN with) (NP (BASENP (PRPD his) (NN finger)) (PP (IN on) (BASENP (DT the) (NN trigger))))))) (PERIOD .))