does welsh use the genitive the same way they use the vocative case? I mean would this sentence also mean "I have swept the floor,Megan."
Modern Welsh does not have noun cases. llawr Megan is 'Megan's floor' by putting the thing owned, llawr, next to and in front of the owner, Megan.
- "I have swept the floor, Megan" - "Dw i wedi ysgubo'r llawr, Megan"
y llawr and Megan separated by the comma, as in the English.