"Yes, I was happy."
Translation:O'n, ro'n i'n hapus.
I typed "Oeddwn, roeddwn i'n hapus." This is what I learned in another course.
Either pattern is correct. ro'n, o'n are common spoken forms that are also used in informal writing.
If I understood well the rule, I can use either O'n, ro'n i'n... or Oeddwn, roeddwn i'n... , but NOT O'n, roeddwn i'n... nor Oeddwn, ro'n i'n...
Is this correct?