Personal format

Can someone please give me the personal formats for,
O blain, and O flaen.
Thank you.

The “base form” is blaen, which mutates in the impersonal form to o flaen (in front of) because of the preposition. If you want to say in front of me and so on, you just insert the according possessive particle and mutate accordingly:
o fy mlaen, o dy flaen, o’i flaen e, o’i blaen hi, o’n blaenau ni, o’ch blaenau chi, o’u blaenau nhw


Thanks Hendrik. Much appreciated.