Breakdown of Þau vita hver höfuðborgin er, er það ekki?
vera
to be
það
it / there (existential) / the one (n)
ekki
not
þau
they (n)
hver
who / what / which (one)
vita
to know (a fact, information)
höfuðborgin
the capital city
Questions & Answers about Þau vita hver höfuðborgin er, er það ekki?
Why is the question tag er það ekki? instead of matching the verb, like 'vita þau ekki?'
The translation says 'what the capital city is'. Why does the Icelandic use hver (who/which) instead of hvað (what)?
In Icelandic, when you ask for the specific identity or name of a noun (like a city, a phone number, or a person's name), you use hver. You only use hvað for abstract concepts or completely unknown things (like 'What is that?'). Because höfuðborg is a feminine noun, we use the feminine form hver.
Could I use þekkja instead of vita here to mean 'know'?
No, because they describe different types of knowing. Vita is used for knowing facts or pieces of information, like knowing the name of a capital. Þekkja is used when you are personally familiar or acquainted with a person, a place, or a thing.
Why does the verb er come at the very end of the first part of the sentence (...hver höfuðborgin er)?
This is because 'what the capital city is' is an indirect question. If you asked it directly, the verb would come right after the question word: Hver er höfuðborgin? But when you embed that question inside another sentence ('They know what...'), the subject (höfuðborgin) comes before the verb (er).
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