Breakdown of Varje fråga tillhör en viss kategori.
en
a, an (common)
frågan
the question
varje
every, each
tillhöra
to belong to
Questions & Answers about Varje fråga tillhör en viss kategori.
Why doesn't tillhör have a preposition after it, like "belongs to" does in English?
In Swedish, tillhör already has the "to" (till) built in as a prefix. Because of this, it acts as a transitive verb and takes a direct object without needing an extra preposition. If you added till after it, it would sound like "belongs to to". Alternatively, you could split it into the phrasal verb hör till (varje fråga hör till...).
Both viss and säker translate to "certain" in English. Why must we use viss here?
You use viss when "certain" means "a particular, but perhaps unspecified, thing"—just like in this sentence. You use säker when "certain" means being "sure" or "confident" about something (for example, jag är säker means "I am sure"). Remember that viss must agree with the noun: en viss, ett visst, vissa.
Could I use varenda instead of varje in this sentence?
You could, but it changes the tone. Varje is the standard, neutral word for "every" or "each". Varenda translates more closely to "every single" and adds strong emphasis. Using varenda fråga would heavily stress that absolutely no question is left out.
What is the grammatical rule for the noun that follows varje?