sindarin_grammar1-9  Exercise 1: Building Sentences
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  i adan nôr        the man runs        (no mutation; adan is the subject)
  cenin 'aladh      I see a tree        (the object softens: galadh -> 'aladh)
  nerin vregol      I run suddenly      (the adverb after the verb softens:
                                         bregol -> vregol)

All reconstructed (Real Elvish Academy summary, which calls itself partly
speculative).