Endurvinnslan er góð fyrir umhverfið.

to be

Breakdown of Endurvinnslan er góð fyrir umhverfið.

• góður: good
• fyrir: for
• endurvinnslan: recycling

Questions & Answers about Endurvinnslan er góð fyrir umhverfið.

Why does endurvinnsla have -n at the end in Endurvinnslan?

-n is part of the definite article attached to the noun.

• endurvinnsla = recycling (indefinite)
• endurvinnslan = the recycling (definite)
  This is how Icelandic usually marks the: it’s added as a suffix rather than a separate word.

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What gender is endurvinnsla, and how can I tell?

Endurvinnsla is feminine. One clue is the definite form endurvinnslan, because -in / -n is a common feminine definite ending in the nominative singular (though you often need to learn gender with the noun).

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Why is the adjective góð and not góður or gott?

Adjectives agree with the noun in gender, number, and case.
Here the subject Endurvinnslan is:

• feminine
• singular
• nominative (because it’s the subject)

So góður (masc.) and gott (neut.) would not match; góð is the correct feminine singular nominative form.

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Is er just the verb to be? Does it change with the subject?