Actually, my sister wrote a story on it.
( Actually ( , ( ( my sister ) ( ( ( wrote ( a story ) ) ( on it ) ) . ) ) ) )
(ROOT (S (ADVP (RB Actually)) (, ,) (NP (PRP$ my) (NN sister)) (VP (VBD wrote) (NP (DT a) (NN story)) (PP (IN on) (NP (PRP it)))) (. .)))
My sister has never written any stories regarding that subject. 
( ( My sister ) ( ( ( has never ) ( written ( ( any stories ) ( regarding ( that subject ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ My) (NN sister)) (VP (VBZ has) (ADVP (RB never)) (VP (VBN written) (NP (NP (DT any) (NNS stories)) (PP (VBG regarding) (NP (DT that) (NN subject)))))) (. .)))