.....or if your doctor says don't walk on your broken leg you might ask "May I walk today?"
Oh dear this is becoming complicated. You haven't given us a list on which letters mutate. Where can I find a list on the website?
As an English speaker I would not say may I walk today - it doesn't make sense.
Explanations of the various mutations and the letters to which they can apply are in the course notes for the sections where they first come up.
To find the course notes, click on 'Topic: Welsh' at the top of this page, then on 'Popular' and then read the sticky discussion on course hints and tips.
Huh. You wouldn't? I would. "You've sent a car for me each morning. May I walk today?" "You are a tough personal trainer. My shins hurt from running so much. May I walk today?" That said, the mutations are complicated and seem to make no sense. Even with the list of mutating letters, WHEN and WHY to mutate seems totally arbitrary.
Mutations are complex. I'm learning more and more, not with DuoLingo sadly, when and where they occur.
You must be VERY polite to say "May I?"
Most British people I know would say "Can I" for the same semantics.