sindarin_grammar1-8  Exercise 1: The Future
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  nor- "run"
    i adan noratha       the man will run
    norathon             I will run
    in edain norathar    the men will run

  padra- "walk"
    i adan padratha      the man will walk
    padrathon            I will walk
    in edain padrathar   the men will walk

Agreed by both summaries: the marker is -tha. The linking vowel (-atha
versus -itha) and the "I" ending differ, so these forms are reconstructed.