Exabyte is right, namárië is Quenya for "Farewell," being a combination of 'na' and 'márië.' Like Exabyte said, -ië is an infinitive (or gerundial) suffix only found in Quenya. Now, the following are a few of my own constructions with Sindarin. I believe them to be correct, but I'm not 100% possitive. I haven't studied the entire language, just the basics:
Ná túro nín! ----- Victory is mine!
Túriel nín! -----Victory shall be mine!
Túriel mín! ----- Victory shall be ours!
Ná túro mín! ----- Victory is ours!
Avom firo údagor! ----- We will not perish without a fight!
Dagro mín! ----- We make war!
Firitha lín! ----- You will die!
Elo! An firo! ----- Behold! For ruin!
Annin meleth nín lé! ----- I give my love to thee!
Lé rúdh! ----- You are bald!
I love working with other languages, and Elvish is so unbelievably awesome. Who agrees with me?