 He found himself thinking in circles of worry and pulled himself back to his problem.
( He ( ( ( ( ( found himself ) ( thinking ( in ( circles ( of worry ) ) ) ) ) and ) ( ( ( pulled himself ) back ) ( to ( his problem ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VP (VBD found) (NP (PRP himself)) (S (VP (VBG thinking) (PP (IN in) (NP (NP (NNS circles)) (PP (IN of) (NP (NN worry)))))))) (CC and) (VP (VBD pulled) (NP (PRP himself)) (PRT (RP back)) (PP (TO to) (NP (PRP$ his) (NN problem))))) (. .)))
He could not afford to get distracted from his problem.
( He ( ( ( could not ) ( afford ( to ( get ( distracted ( from ( his problem ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (MD could) (RB not) (VP (VB afford) (S (VP (TO to) (VP (VB get) (VP (VBN distracted) (PP (IN from) (NP (PRP$ his) (NN problem))))))))) (. .)))