The easiest past tense uses 'gwneud' (to do) as a helper: 'Wnes i' (I did), 'Wnest ti', 'Wnaeth e/hi', then the verb-noun, whose first letter softens. 'Mynd' is irregular and usually appears as 'Es i' (I went).
Examples
- Wnes i weld ffilm dda neithiwr.
- I saw a good film last night.
- Es i i'r dref ddydd Sadwrn.
- I went to town on Saturday.
- Wnaeth hi brynu llyfr newydd.
- She bought a new book.
The mistake to avoid
Leaving the verb unsoftened — it's 'Wnes i weld', not 'Wnes i gweld'.
Where this fits in
Y gorffennol a'r penwythnos diwethaf, Welsh A2: Talk about the past: yesterday, last weekend, and travel memories.