Board Thread:Suggestions forum/@comment-26005323-20190216111940/@comment-26005323-20190313140934

Adding on the examples of outdated Elvish use.

I amar prestar aen, han mathon ne nen, han mathon ne chae a han noston ned wilith. This sentence is great in its once time, but sadly many discoveries on Sindarin had been discovered after the films were aired, especially on the past tense. Thus this sentence had become inaccurate in grammar. So a somewhat correct Sindarin phrase would be: Prestannen i Amar. De felin vi nên, de felin vi gef, a de noston vin gwilith. Remember that even now Sindarin is subject to change, as there is still a major document on Sindarin that hasn't been released yet.

The rudest word an elf would mutter would be "Ego!", which basically means "F*** off" or "Begone" if you want to sound archaic.

It won't make sense for the Silvan Elves to learn Quenya. Quenya was banned by Elu Thingol in Beleriand in the First Age, and since then Sindarin had become the Lingua Franca of Elvendom.

As an added bonus: Elves don't use the names of the Valar lightly, see here for more information. I won't mind if you use the speech bank  of RealElvish. In fact, I think Fiona won't mind too, as she made it for RPG purposes.