Kertið brennur lengi, en ég geymi líka auka rafhlöðupakka fyrir vasaljósið.

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Breakdown of Kertið brennur lengi, en ég geymi líka auka rafhlöðupakka fyrir vasaljósið.

• líka: also
• fyrir: for
• en: but

Questions & Answers about Kertið brennur lengi, en ég geymi líka auka rafhlöðupakka fyrir vasaljósið.

Why does kert have -ið at the end (Kertið)?

-ið is the Icelandic definite article attached to a neuter singular noun.

• kert = a candle (neuter, singular, indefinite)
• kert-ið = the candle (neuter, singular, definite)
  So Kertið brennur... literally starts with The candle burns....

What form is brennur, and what verb is it from?

brennur is present tense, 3rd person singular of the verb að brenna (to burn).

• ég brenni = I burn
• þú brennur = you burn
• hann/hún/það brennur = he/she/it burns
  Here, kertið is 3rd person singular (it), so you get brennur.

Does brenna mean “to be on fire” or just “to burn (like a candle)”?

In this context, Kertið brennur is the normal, neutral way to say a candle is burning / burning steadily.
að brenna can also mean to burn (be on fire) in other contexts, but with candles it’s the everyday verb.

Why is lengi used, and what part of speech is it?