Questions & Answers about Mjólkin er skemmd, svo ég kaupi nýja.
In Icelandic, the definite article is usually attached to the end of the noun instead of being a separate word.
- mjólk = milk
- mjólkin = the milk
So the ending -in here is the definite article.
Mjólkin is in the nominative singular.
That is because it is the subject of the sentence: it is the thing that is spoiled.
So:
- mjólkin = subject
- therefore it appears in the nominative
Because skemmd has to agree with mjólkin.
Mjólk is:
- feminine
- singular
- here, nominative
So the adjective/past participle must also be feminine singular nominative:
- masculine: skemmdur
- feminine: skemmd
- neuter: skemmt
Since mjólkin is feminine, skemmd is the correct form.