Re-read the book 'Cantre'r Gwaelod.'
Search for any words containing the sounds ch, ff, ll, dd and write them down.
Try and say the tongue twisters!
Play "Codi Gair." Cut the words up on the sheet. Ask someone else to read the book to you and every time you hear one of the words provided on the 'Codi Gair' sheet, lift it up to show!