目撃者が何を見たのかを伝えるのは困難すぎるが、しかし何かがそこに居たと述べる。
(S (S (SBAR (S (PP-SBJ (NP (S-NSBJ (VP (PP-OBJ (SBAR (SBAR (S (PP-SBJ (BASENP (NN 目撃) (NN 者)) (IN が)) (VP (PP-OBJ (BASENP (NN 何)) (IN を)) (VP (VBV 見) (VP (MD た))))) (NN の)) (INFKB か)) (IN を)) (VB 伝える))) (NN の)) (IN は)) (ADJP (ADJP (NN 困難)) (VP (VB すぎる)))) (INCON が)) (CONJP (COMMA 、) (CON しかし)) (S (S-NSBJ (VP (SBAR (S (PP-SBJ (BASENP (NN 何) (INFKB か)) (IN が)) (VP (PP (BASENP (NN そこ)) (IN に)) (VP (VBV 居) (VP (MD た))))) (INQT と)) (VB 述べる))))) (PERIOD 。))