(S (S (SBAR (S (PP-SBJ (BASENP (NN 銃)) (IN が)) (VP (VBV 落ち) (VP (MD た)))) (INCON ので)) (S (S-NOBJ (PP-SBJ (BASENP (NN 彼)) (IN は)) (VP (PP (NP (PP (BASENP (NN 自分)) (IN の)) (NN 方)) (IN に)) (VBV 引きつけ))) (COMMA 、) (S (ADVP (NN 偶然) (INRB に)) (S-NSBJ (VP (PP-OBJ (BASENP (NN 引き金)) (IN を)) (VP (VBV 引い) (VP (MD た)))))))) (PERIOD 。))
銃 が 落ち た ので 彼 は 自分 の 方 に 引きつけ 、 偶然 に 引き金 を 引い た 。
As it fell away he pulled it towards him and accidentally fired the trigger .