Origin of prepositions/postpositions

I'd like some input on how prepositions/postpositions
may arise in a language.  The scenario is essentially
a language that has had cases but lost them through
regular sound change.  I'm aware that adpositions may
arise from nouns, adverbs or verbs, but am a little
hazy on how the latter in particular works.  Also I'm
aware that some languages get along with basically three
prepositions ("to, from, in"), e.g. French.
--


/BP 8^)>
--
Benct Philip Jonsson -- melroch at melroch dot se

    "Maybe" is a strange word.  When mum or dad says it
    it means "yes", but when my big brothers say it it
    means "no"!

                            (Philip Jonsson jr, age 7)

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