days, months and years days of the week dydd Llun Monday Mawrth Tuesday Mercher Wednesday Iau Thursday Gwener Friday Sadwrn Saturday Sul Sunday For "Monday night" substitute 'Nos (SM)' for Dydd, i.e. Nos Fawrth is Tuesday Night. day phrases yesterday today tomorrow ddoe heddiw yfory am bore ddoe bore 'ma bore 'fory pm p'nawn ddoe p'nawn 'ma p'nawn yfory night neithiwr heno nos yfory months of the year mis Ionawr January Chwefror (or Mis Bach) February Mawrth (must use 'mis' to differentiate from Tuesday) March Ebrill April Mai May Mehefin June Gorffennaf July Awst August Medi September Hydref October Tachwedd November Rhagfyr December Year Phrases 1. Blwyddyn is the basic singular word for Year, e.g. O'n I yn yr Almaen am flwyddyn, I was in Germany for a year. 2. Blynedd is used after numbers (except 1). one year un flwyddyn two years dwy flynedd three years tair blynedd four years pedair blynedd five years pum mlynedd six years chwe blynedd seven years saith mlynedd eight years wyth mlynedd or blynedd nine years naw mlynedd ten years deng mlynedd 3. Blwydd (oed) is used after numbers to mean 'years old' with the same mutation pattern as above. 4. Blynyddoedd is the plural of blwyddyn and is restricted to cases where 'years' isn't used with a number, e.g. 'flynyddoedd yn ol' years ago.