Oes (in time - rather than the affirmative answer form to …is there?) Are oes and oed(ran) interchangeable?
Not always. For instance, you can use either to mean “life-span”, but for “X years old” you can only say X blwydd oed, not X blwydd oes
Oes is also used for periods of time in the past, e.g. Oes yr Iâ - the Ice Age.
Diolch, I’m happy with oes as an historical term and would normally use oed for age.
Guess the answer is that generally they are not interchangeable! Diolch.
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