The possessive pronouns are: mine, yours, his, hers, its, ours, yours, theirs
The cat has a tail. Its tail is fairly long.
It's (it is=det är) very cold outside today.
EXERCISES with its/it's
In the same way, do not mix up theirs/there's:
theirs=deras
there's=there is/there has
For example:
The house is theirs. There's (there has) always been a house on that plot of land. There's (there is) an apple tree next to the house.
Its/it's
Do not mix up the possessive pronoun its (=dess) and it's (=it is).
For example: