Vocabulary - to want
A few different ways (that I know) to express wishes and desires.
eisiau - to want. One of the standard ways of saying you want something, all across Wales. In truth, it’s not actually a verbnoun like many others, it’s really a noun. That’s why you don’t need the ‘yn’ before it ad you would for any other verbnoun: ‘yn mynd’, ‘Dwi’n mynd’. ‘Dyn ni’n aros.’ Etc.
‘Dwi eisiau cysgu.’ I want to sleep.
I believe the reason for this is an older construction that is used in literary Welsh, but that got shortened and dropped off over time in colloquial Welsh. ‘bod ... ar [rhywun]’ was the construction used, roughly meaning to have ‘a want upon you’ (very roughly).
Double checking this with Wiktionary (beloved), they do have a credible literary source demonstrating this: the Welsh bible (which thanks to a frenzied linguistics and orthography-fuelled spiral down Wikipedia, and oddly enough, the Welsh comedian and radio broadcaster Elis James (unrelatedly), I know was first translated in the 1500s and directly led to the loss of the letter ‘k’ from the Welsh alphabet).
‘Yr Arglwydd yw fy Mugail; ni bydd eisiau arnaf.’ The Lord is my shepherd; I shall not want.
Close enough to colloquial Welsh to understand, that's using ‘eisiau arna (i)’. Over time, colloquial Welsh has dropped the ‘ar’. The example sentence above could've been 'Dwi eisiau cysgu [arna i]'.
A note. Some people have a misconception that eisiau should cause a soft mutation in the word following it, because it is an exceptional case of an action (of sorts) that doesn’t need an ‘yn’, and so must follow a pattern similar to a few other conjugations out there like ‘dylu’ (should).
‘Dylet ti ddweud rhywbeth’ (You should say something), ‘Galla i wneud rhywbeth amdano fe’ (I can do something about it), ‘Ga i rywbeth?’ (Can I have something?), the past tenses of gwneud, ‘wnaethon ni ddysgu Cymraeg’, ‘Mae rhaid iddyn nhw dduhino’n gynnar!’ (They must wake up early!)
And so on. This isn’t the case, as eisiau is not a conjugated verb. It’s just a noun for desire! (*not exactly. I’m trying to explain this as best I can)
There is a south Walian usage of ‘eisiau’ that makes this idea clearer.
In some southern dialects, the construction ‘mae eisiau i…’ is used to mean that someone needs something. E.g. ‘Mae eisiau i ti fwyta’ means ‘you need to eat’. What it literally means is ‘there is a need for you to eat’, and so you can see the noun eisiau (a need) in use.
North Walian Welsh uses the same structure, but with the noun angen instead. ‘Mae angen i ti fwyta.’ ‘Mae angen iddyn nhw sosban’, literally, ‘they are in need of a saucepan’.
Speaking of dialect differences, especially in north Wales Welsh, you might come across spelling variants of eisiau: ‘isio’, ‘isia’, (N) ‘isie’ (S), ‘isho’, etc. Perks of a phonetic language are that nothing’s a misspelling really if it sounds alright when said out loud. I did raise an eyebrow at the last one a little, ‘sh’ isn’t the English ‘sh’ in Welsh, is it? (Is that Wenglish?)
Other forms!
moyn - to want. Used pretty much only in the south and valleys, but this one is a regular verbnoun. ‘Dwi’n moyn cwpla fy ngwaith gytre’n fuan’ (I want to finish my homework soon)
(Just realised there are a Lot of dialect words in that sentence! Cwpla -> gorffen, gytre -> cartef)
It seems simpler than the exceptional eisiau construction, why isn’t it more widely accepted?, you ask. (Most people I’ve said it to say it immediately places you geographically to them because they never hear anyone else say it.) It derives from an older verb, ymofyn, which itself comes from the word gofyn (to ask), ‘ym’ + ‘gofyn’ = ‘ymofyn’, which sort of goes away from the original idea of wanting, and into one of asking. Still, language evolves, and so you will still hear moyn in South Wales. In fact, the Say Something In Welsh course teaches it (which is how I know it. Probably worth giving a disclaimer that I’m simply mad about linguistics and Welsh alternative bands, before anyone starts to think I live in Wales just because I occasionally write long grammar posts!)
Awydd - a desire. Used similarly to eisiau, no ‘yn’ precedes it. The whole point of making this post was that I just came across this sentence: ‘Ti awydd mynd i Gastell Caerfili?’ Meaning, do you want to go to Caerphilly Castle?
And those are the ones I know!