Learn Finnish: Saat yksinoikeuden, kunhan uusit sopimuksen. - You get the exclusive right, provided that you renew the contract.

While jos simply introduces a neutral condition, kunhan adds a sense of a minimum requirement or a strong condition. It translates best to 'provided that', 'as long as', or 'on the condition that'. The clitic -han attached to kun turns it from a basic time marker into this conditional-temporal conjunction.

Both yksinoikeuden and sopimuksen end in -n. Why are these objects in the genitive-accusative case here?

They are total objects indicating that the actions are seen as complete or definitive. You get the entire exclusive right (yksinoikeuden) and you must renew the whole contract (sopimuksen). If the verbs implied an ongoing or incomplete process, these would be in the partitive case instead.

What is the base form of yksinoikeuden and why is there a d in it?

The base form is the compound word yksinoikeus (exclusive right), made of yksin (sole/alone) and oikeus (right). Nouns ending in -eus typically have a stem ending in -te- (making it oikeute-). Adding the -n ending closes the syllable, which triggers consonant gradation and softens the strong t into a weak d, giving us yksinoikeuden.

The verb looks exactly like the adjective for 'new' (). How does that work?