Questions & Answers about Ég tek heyrnartólin með mér í strætó á morgnana.
Taka is the infinitive, meaning to take.
Tek is the 1st person singular present tense form, used with ég.
So:
- að taka = to take
- ég tek = I take
This is just normal Icelandic verb conjugation.
The ending -in is the definite article attached to the noun.
So:
- heyrnartól = headphones
- heyrnartólin = the headphones
In Icelandic, the definite article is often added to the end of the word instead of being a separate word like English the.
It is usually treated as a plural noun, much like English headphones.
That means heyrnartólin is best understood as the headphones, not the headphone.
In this sentence it is the direct object of tek, so it is in the accusative, but for this neuter plural noun the form looks the same as the nominative.