"Rhaid i fi gofio bwyta."

Translation: I must remember to eat.

[FaizalZahid]

Are there words like these - gofio = to remember, anghofio = to forget, adding 'an' in front of a word to make it opposite or is this just a coincidence?

[mizinamo]

Yes, an- is a prefix to make opposites. It takes nasal mutation, e.g. c becomes ngh (cofio "remember", anghofio "forget"), t becomes nh (teg "beautiful", annheg "unfair; unbeautiful, inelegant), p becomes mh etc.

The -n of an- sometimes disppears, hence anghofio rather than annghofio.

[NicDafis]

Another nice one is trefn "order, system" and anhrefn "disorder, chaos". Yr Anhrefn were a Welsh punk band:
https://www.youtube.com/watch?v=pYs0xsXIYWw

[FaizalZahid]

Wow! This should make it easier...diolch! XD