Trúir þú því?

Breakdown of Trúir þú því?

þú
you
trúa
to believe
því
it (dative)

Questions & Answers about Trúir þú því?

Why does this sentence use því instead of það for "it"?
The verb trúa (to believe) requires its object to be in the dative case. While the basic word for "it" is það, its dative form is því.
How does the word order make this a question?
To ask a yes/no question in Icelandic, you simply swap the subject and the verb. A statement like "You believe" (Þú trúir) becomes a question just by flipping the order to Trúir þú? (Do you believe?). You do not need to add a word like "do".
How would I say "Do you believe him" or "Do you believe her"?
Because trúa forces the next pronoun into the dative case, you must use the dative versions of those pronouns. "Him" becomes honum (Trúir þú honum?) and "her" becomes henni (Trúir þú henni?).
Why does this sometimes sound like "Trúirðu" in spoken Icelandic?
When a verb ends in an -r (like trúir) and is followed immediately by þú, Icelanders almost always blend them together in everyday speech. The þ softens into a ð sound, making Trúir þú sound like trúirðu.

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