sindarin_grammar1-6  Exercise 2: Two Ways to Say "My"
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  lammen        lam "tongue" + ending -n    -> noun ending (summary A)
  i higil nín   higil "knife" + nín         -> separate word after the noun,
                softened (summary B: "the knife my")

Both put the possessor on or after the noun, not before it as in English.
lammen is from the elvish.org summary; i higil nín is from a page that calls
itself partly speculative, so it is reconstructed.