I was on this earth you know, I've lived on this earth for some reason, I just don't know what it is yet.
( I ( ( was ( on ( ( this earth ) ( you ( know ( ( , ( ( I ( 've ( lived ( on ( ( this earth ) ( for ( some reason ) ) ) ) ) ) ) , ) ) ( I ( just ( ( do n't ) ( know ( what ( it ( is yet ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD was) (PP (IN on) (NP (NP (DT this) (NN earth)) (SBAR (S (NP (PRP you)) (VP (VBP know) (SBAR (S (PRN (, ,) (S (NP (PRP I)) (VP (VBP 've) (VP (VBN lived) (PP (IN on) (NP (NP (DT this) (NN earth)) (PP (IN for) (NP (DT some) (NN reason)))))))) (, ,)) (NP (PRP I)) (ADVP (RB just)) (VP (VBP do) (RB n't) (VP (VB know) (SBAR (WHNP (WP what)) (S (NP (PRP it)) (VP (VBZ is) (ADVP (RB yet))))))))))))))) (. .)))
I don't yet know the reason why I have lived on earth. 
( I ( ( ( ( do n't ) yet ) ( ( know ( the reason ) ) ( why ( I ( have ( lived ( on earth ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP do) (RB n't) (ADVP (RB yet)) (VP (VB know) (NP (DT the) (NN reason)) (SBAR (WHADVP (WRB why)) (S (NP (PRP I)) (VP (VBP have) (VP (VBN lived) (PP (IN on) (NP (NN earth))))))))) (. .)))