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Questions & Answers about Staðreyndin er sönn.
Why is the adjective sönn instead of sannur?
Adjectives must match the gender of the noun they describe. Staðreyndin (the fact) is a feminine noun, so the adjective takes the feminine singular form. The base word sannur (true) drops its masculine -ur ending and the root vowel a shifts to ö to become sönn.
How can I tell that staðreyndin is a feminine noun?
The definite article (the attached 'the' part at the end) is -in, which is a strong clue that it is a feminine singular noun. The base word is staðreynd, and in Icelandic, nouns ending in -nd are almost always feminine.
How would I use this sentence in an indirect question with hvort?