all things we 've seen before 
(ROOT (NP (NP (DT all) (NNS things)) (SBAR (S (NP (PRP we)) (VP (VBP 've) (VP (VBN seen) (ADVP (RB before))))))))
(ROOT (NP (NP (DT ) (NNS )) (SBAR (S (NP (PRP )) (VP (VBP ) (VP (VBN ) (ADVP (RB ))))))))