Questions & Answers about Voda u boci nije bila bistra; bila je mutna i topla.
Because u means in here and expresses a location, so it requires the locative case.
- boca = bottle
- u boci = in the bottle
A very useful rule is:
- u + accusative = motion into
- u + locative = location in
So:
- Voda je u boci. = The water is in the bottle.
- Stavio sam vodu u bocu. = I put the water into the bottle.
Notice the difference:
- boci = locative
- bocu = accusative
Yes. Voda is a feminine noun in Croatian.
Because it is feminine singular, the adjectives that describe it also have feminine singular forms:
- bistra = clear
- mutna = cloudy/murky
- topla = warm
They all end in -a because they agree with voda.
So:
- voda → feminine singular
- bistra / mutna / topla → feminine singular to match it
This kind of agreement is very important in Croatian.