Hän on kumppani, jonka verkosto on luotettava.

Questions & Answers about Hän on kumppani, jonka verkosto on luotettava.

Why do we use jonka here instead of joka?
jonka is the genitive (possessive) form of the relative pronoun joka. Just like "who" becomes "whose" in English to show possession, joka becomes jonka to show that the network belongs to the partner.
Would jonka change if we were talking about multiple networks?
No! The relative pronoun joka gets its number (singular or plural) from the word it refers back to, not the word it owns. Because it refers back to a single partner (kumppani), it stays in the singular genitive jonka, even if the partner had many networks (jonka verkostot).
How would this sentence change if we were talking about multiple partners?
If the main clause was "They are partners" (He ovat kumppaneita), the relative pronoun would need to be in the plural genitive form because it refers back to a plural word. "Whose" would change from jonka to joiden: He ovat kumppaneita, joiden verkosto on luotettava.
What is the word luotettava based on?
luotettava (reliable/trustworthy) comes from the verb luottaa (to trust). The -ttava/-ttävä ending works a bit like "-able" in English, turning a verb into an adjective that describes something that can be trusted.
Why is there a comma before jonka?
In Finnish, you must always put a comma before a relative clause (a phrase starting with a relative pronoun like joka or jonka). Unlike English, where commas before "who" or "whose" depend on whether the clause is defining or non-defining, Finnish keeps it simple: always use a comma!

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