I just stopped where I was.
( I ( just ( ( stopped ( where ( I was ) ) ) . ) ) )
(ROOT (S (NP (PRP I)) (ADVP (RB just)) (VP (VBD stopped) (SBAR (WHADVP (WRB where)) (S (NP (PRP I)) (VP (VBD was))))) (. .)))
I stopped in my tracks
( I ( stopped ( in ( my tracks ) ) ) )
(ROOT (S (NP (PRP I)) (VP (VBD stopped) (PP (IN in) (NP (PRP$ my) (NNS tracks))))))