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 ))))))) (. )))