I am seeing ‘ydoedd’ and ‘ydynt’ used in contexts such as ‘Un o Lechfaen ydoedd’, as in ‘He/she was from Llechfaen.’ This is in preference to ‘Un o Lechfaen oedd e/hi’.
I can’t find anything about this in Gareth King. There is short mention of it ‘Comparative Stylistics of Welsh and English.’ by Morris and Rottet, but not much detail.
Is this literary only?
What are the other forms?
Does the construction exist in other tenses?
Diolch yn fawr iawn.
Ian Richards, Machynlleth
Because it’s strictly LitWelsh. Every living and sane Welsh speaker would say (as you mention) Un o Lechfaen oedd e/hi. 
But I could mention it in a future edition, if you like?
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Other forms you may come across are:
ydwyf, ydwyt, ydyw (all present tense)
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Diolch Gareth.
Mae rhaid i fi benderfynu ydw i’n ‘sane Welsh speaker!’ Does dim rhaid i’w gynnwys yn yr argraffiad nesaf - s’dim ots ai dim ond ffurf lenyddol ydoedd (wps!).
Ian
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Diolch Siaron,
Rwyf i wedi dod o hyd i’r gystrawen mewn llyfrau. Mae Gareth wedi cadharnau mai dim ond ffurf lenyddol yw hyn.
Cofion gorau
Ian
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