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Re: Monosyllabic words with tonos
by Greg Brush - Friday, 6 May 2016, 01:37 PM
  Τhe reason why, as Nick and I explained, is to make clear in writing which meaning is intended:
πώς; - how? vs. πως - that
πού; - where? vs. που - which
ή - or vs. η - the (fem.)
μού - to me vs. μου - mine

Note that in speech the interrogatives πώς and πού and the weak pronouns (μου, σου, του, της, μας, σας, τους) are stressed, while the conjunction πως, the relative pronoun που, and the possessive pronouns (μου, et al.) are not.

Greg Brush