Questions & Answers about Höfuðverkurinn minnkar þegar ég drekk heitt te.
Because it is built as a compound plus the definite article:
- höfuð = head
- verkur = pain, ache
- höfuðverkur = headache
- -inn = the suffixed definite article, roughly the
So höfuðverkurinn literally breaks down as head-ache-the = the headache.
This kind of long compound is very normal in Icelandic.
The ending -inn is the definite article attached to the noun. Icelandic usually puts the at the end of the noun instead of using a separate word.
So:
In this sentence, it refers to a specific headache, not just headaches in general.
It is in the nominative singular because it is the subject of the verb minnkar.
The structure is:
So the thing doing the decreasing is the headache, which is why the noun is nominative.