do n't say you were n't warned 
(ROOT (S (VP (VB do) (RB n't) (VP (VB say) (SBAR (S (NP (PRP you)) (VP (VBD were) (RB n't) (VP (VBN warned)))))))))
(ROOT (S (VP (VB ) (RB ) (VP (VB ) (SBAR (S (NP (PRP )) (VP (VBD ) (RB ) (VP (VBN )))))))))