I just can't remember.
( I ( just ( ( ( ca n't ) remember ) . ) ) )
(ROOT (S (NP (PRP I)) (ADVP (RB just)) (VP (MD ca) (RB n't) (VP (VB remember))) (. .)))
I remember everything now. 
( I ( ( ( remember everything ) now ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP remember) (NP (NN everything)) (ADVP (RB now))) (. .)))