I will some day, if you ask me, she promised him, smiling. 
( ( I ( will ( ( ( some day ) , ) ( if ( you ( ask me ) ) ) ) ) ) ( , ( she ( ( ( ( promised him ) , ) smiling ) . ) ) ) )
(ROOT (S (S (NP (PRP I)) (VP (MD will) (S (NP (NP (DT some) (NN day)) (, ,) (SBAR (IN if) (S (NP (PRP you)) (VP (VBP ask) (NP (PRP me))))))))) (, ,) (NP (PRP she)) (VP (VBD promised) (NP (PRP him)) (, ,) (S (VP (VBG smiling)))) (. .)))
The corners of her mouth tightened and her brow furrowed as she promised him that she would someday. 
( ( ( ( ( ( The corners ) ( of ( her mouth ) ) ) tightened ) and ) ( ( her brow ) ( furrowed ( as ( she ( ( promised him ) ( that ( she ( would someday ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NNS corners)) (PP (IN of) (NP (PRP$ her) (NN mouth)))) (VP (VBD tightened))) (CC and) (S (NP (PRP$ her) (NN brow)) (VP (VBD furrowed) (SBAR (IN as) (S (NP (PRP she)) (VP (VBD promised) (NP (PRP him)) (SBAR (IN that) (S (NP (PRP she)) (VP (MD would) (ADVP (RB someday)))))))))) (. .)))