I'w vs a'u

Welsh Lolfa SSiW Lounge
#1

I am really confused about when to shorten ‘eu’ (their) to 'w and when to shorten to 'u.

If I want to say “and their” it’s “a’u”, but if it’s “to their” it’s “i’w”. Why does the “eu” shorten to “'w” instead of “'u”? And how do I know which to use? Do all prepositions take 'w or is it more complicated than that?

#2

I’m afraid I don’t know, but I suggest you put this in the “Tiny questions with quick answers” thread. If you need help finding it, it’s in the General / Questions part of the forum. Lots of grammar nerds / experts look at that thread regularly so it’s usually not a long wait.