Dóttir þeirra er tólf ára.

Questions & Answers about Dóttir þeirra er tólf ára.

Does the number tólf change its ending depending on what it is counting?
No, unlike the numbers 1 through 4 which change based on gender and case, the numbers 11 through 20 do not change their form. The word for twelve is always just tólf.
Why is the word for years ára here instead of the standard plural ár?
When stating someone's age in Icelandic, you use the genitive (possessive) case. You are literally saying that the daughter is twelve 'of years'. The word ára is the genitive plural form of ár (year).
Why does the word for 'their' (þeirra) come after 'daughter' (dóttir)?
In Icelandic, possessive words like þeirra usually come directly after the noun they belong to, which is the opposite of the English word order 'their daughter'.
Why isn't it dóttirin (the daughter) instead of just dóttir?
When talking about close family members with a possessive word, Icelanders often use the indefinite form (without the attached 'the' ending). So dóttir þeirra is the standard and most natural way to express this.

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