Þetta er herbergið þeirra og dótið hans.

Breakdown of Þetta er herbergið þeirra og dótið hans.

þetta
this
vera
to be
og
and
hans
his
þeirra
their / theirs
dótið
the stuff
herbergið
the room

Questions & Answers about Þetta er herbergið þeirra og dótið hans.

Why are the words "herbergið" and "dótið" in the "the" form when we are saying "their room" and "his stuff"?
In Icelandic, possession is usually shown by putting the possessor word after the noun, and adding the definite ("the") ending to that noun. So, instead of saying "room their", you literally say "the room their" (herbergið þeirra) and "the stuff his" (dótið hans).
Do the words "þeirra" and "hans" change to match the gender of the room or the stuff?
No, and that makes them very easy to use! Because hans (his), hennar (her), and þeirra (their) are genitive pronouns, they only reflect the person who owns the item. They never change their form to match the noun they are attached to.
Why does "herbergið" only add a "-ð" for "the", but "dótið" adds "-ið"?
Both herbergi (room) and dót (stuff) are neuter nouns. Because herbergi already ends in a vowel, it just takes a -ð to become herbergið. Since dót ends in a consonant, it needs the full -ið ending to become dótið.
Since both room and stuff are neuter nouns, is that why we use the neuter word "Þetta" for "This"?
Actually, no! When you point to something and say "This is...", you always use the general neuter form Þetta er, regardless of the gender or even how many things come after it. It just works as a general "This thing here is..." introduction.

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