Questions & Answers about Kvöldið er gott.
Kvöldið is kvöld (evening) with the definite article attached as a suffix:
- kvöld = an evening / evening (indefinite)
- kvöldið = the evening (definite)
In Icelandic, the definite article is usually not a separate word like English the; it’s typically added to the end of the noun.
-ið is the nominative singular definite ending for many neuter nouns.
Here, kvöld is a neuter noun, so the evening becomes kvöld + ið → kvöldið.
You usually learn gender with the noun (dictionary entries mark it, or you memorize it). It matters because gender controls forms like:
- the definite ending on the noun (-ið for many neuters)
- the adjective agreement (gott is neuter here)
So kvöld being neuter is why you get kvöldið and gott.