Usages of þín
Farðu út með fjölskyldu þinni, njóttu dagsins.
Go outside with your family; enjoy the day.
Bókin þín er góð.
Your book is good.
Þessi stutta skýring dugði mér ekki, en glósurnar þínar nýtast mér vel.
This short explanation was not enough for me, but your notes are useful to me.
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We have an entire course teaching Icelandic grammar and vocabulary.