Ulven wrote:Käymälä, then? Or I'll just stick with vessapytty?
Well, "vessapytty" is the toiletseat, I mean the whole white ceramic thing. "Käymälä" is "toilet" in general.
Ulven wrote:How does uusi morph/transform? Is uuden from uusi?
The stems for uusi can be gotten from these:
uuden (genitive/ accusative)
So "uuden" is the genitive/accusative of "uusi"
Ulven wrote:Is it just uusi that doesn't take the -ni ending in that situation? because I though other adjectives did. Words like kaunis, for example. That takes the -ni ending "Minun kaunini sanani" or not?
I put the -ni in parenthesis in your corrected post because I wasn't sure whether you wanted to be colloquial or not. Colloquially, the -ni (and other personal possessive suffixes) are often left out. But adjectives don't have them even officially (unless the adjecive functions as a noun). So it would be:
Minun uusi sanani
Sinun kaunis sanasi
Hänen uusi autonsa