sindarin_grammar1-9  Exercise 2: Question and Negation
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  Man agorech?   What did you do?
    man     what
    agorech did (agor "did" + ending -ch "you")

  La chebin estel anim   I do not keep hope for myself
    la      not
    chebin  I keep (cebin, softened by la: c -> ch)
    estel   hope
    anim    for myself

la softens the next word. Both examples are from the elvish.org summary,
which cites them to a Tolkien journal; I could not check them further.