Questions & Answers about Ég verð þreyttur eftir vinnu.
Because verða means to become / to get, while vera means to be.
So:
- Ég verð þreyttur eftir vinnu = I get tired after work
- Ég er þreyttur eftir vinnu = I am tired after work
In Icelandic, verða is often used when you are talking about a change of state.
Verð is the 1st person singular present tense of verða.
That means it matches ég (I):
- ég verð = I become / I get
- þú verður = you become / you get
- hann/hún/það verður = he/she/it becomes
A learner may notice that the infinitive is verða, but the present-tense forms change quite a bit, so this is a verb worth memorizing.