I guess he thought you'd turned up your toes.
( I ( ( guess ( he ( thought ( you ( 'd ( ( turned up ) ( your toes ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP guess) (SBAR (S (NP (PRP he)) (VP (VBD thought) (SBAR (S (NP (PRP you)) (VP (VBD 'd) (VP (VBN turned) (PRT (RP up)) (NP (PRP$ your) (NNS toes)))))))))) (. .)))
He made a grave mistake by thinking incorrectly.
( He ( ( ( made ( a ( grave mistake ) ) ) ( by ( thinking incorrectly ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD made) (NP (DT a) (JJ grave) (NN mistake)) (PP (IN by) (S (VP (VBG thinking) (ADVP (RB incorrectly)))))) (. .)))