Your memories are probably very similar.
( ( Your memories ) ( ( ( are probably ) ( very similar ) ) . ) )
(ROOT (S (NP (PRP$ Your) (NNS memories)) (VP (VBP are) (ADVP (RB probably)) (ADJP (RB very) (JJ similar))) (. .)))
Your memories are probably not at all similar.
( ( Your memories ) ( ( ( ( are probably ) not ) ( ( at all ) similar ) ) . ) )
(ROOT (S (NP (PRP$ Your) (NNS memories)) (VP (VBP are) (ADVP (RB probably)) (RB not) (ADJP (ADVP (IN at) (DT all)) (JJ similar))) (. .)))