"South America is a big continent."
Translation:Cyfandir mawr yw De America.
January 27, 2016
They are generally completely interchangeable - just use one or the other consistently.
However, only ydy should be used when starting simple, unemphatic questions or giving an answer ‘yes’:
- Dewi ydy/yw’r tala - Dewi is the tallest
- Ydy Dewi’n dal? Ydy. - Is Dewi tall? Yes.
- Faint ydy/yw’r y tocynnau? - How much are the tickets?