Röðin í matvöruversluninni var löng á föstudag, svo ég fór heim.

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Breakdown of Röðin í matvöruversluninni var löng á föstudag, svo ég fór heim.

• vera: to be
• fara: to go
• á: on

Questions & Answers about Röðin í matvöruversluninni var löng á föstudag, svo ég fór heim.

Why does röð appear as Röðin?

Röðin is röð (line/queue) with the definite article attached as a suffix: röð + -in → röðin = the line.
It’s also in the nominative singular because it’s the subject of the clause (Röðin … var …).

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How do I know Röðin is feminine, and does that matter here?

Röð is feminine. Gender matters because it affects:

• the definite ending: feminine nominative singular often uses -in (as in röðin)
• adjective agreement: löng is feminine nominative singular to match röðin

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What does í matvöruversluninni mean grammatically, and why does the noun end in -inni?

í can govern either:

• accusative (movement into), or
• dative (location in/inside)

Here it’s location, so it takes dative: í …-inni = in the (specific) grocery store.
matvöruversluninni is matvöruverslun + definite dative singular ending -inni.

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Why is it the store (-inni) but also the line (-in)? Is Icelandic always this “double definite”?