 Hmmm, might be an abalone shell.
( Hmmm ( , ( ( might ( be ( an ( abalone shell ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Hmmm)) (, ,) (VP (MD might) (VP (VB be) (NP (DT an) (JJ abalone) (NN shell)))) (. .)))
I do not believe there is a possibility that this is an abalone shell.
( I ( ( ( do not ) ( believe ( there ( ( is ( a possibility ) ) ( that ( this ( is ( an ( abalone shell ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP do) (RB not) (VP (VB believe) (SBAR (S (NP (EX there)) (VP (VBZ is) (NP (DT a) (NN possibility)) (SBAR (IN that) (S (NP (DT this)) (VP (VBZ is) (NP (DT an) (JJ abalone) (NN shell)))))))))) (. .)))