Päärynä on hedelmä, jonka isoisä kasvatti.

Breakdown of Päärynä on hedelmä, jonka isoisä kasvatti.

olla
to be
hedelmä
fruit
kasvattaa
to grow (something)
päärynä
pear

Questions & Answers about Päärynä on hedelmä, jonka isoisä kasvatti.

This lesson is about the agent participle (-ma / -mä). How can I rewrite this sentence to actually use it?
You would turn the relative clause into a participle structure. The doer of the action (isoisä) goes into the genitive case (isoisän), and the verb kasvattaa (to grow) takes the -ma ending to become kasvattama. The new sentence is: Päärynä on isoisän kasvattama hedelmä. (The pear is a fruit grown by grandfather).
Why is the relative pronoun joka (that/which) in the genitive form jonka in this sentence?
Because it acts as the total object of the verb kasvatti (grew). When an action is completed and the sentence has a normal subject doing the action (isoisä), a singular total object takes the -n ending. So, the base form joka becomes jonka.
If we rewrite it as isoisän kasvattama hedelmä, why does isoisä also take the genitive -n ending?
In an agent participle structure, the person doing the action (the agent) must always be in the genitive case. Think of it like possession: it translates literally as "grandfather's grown fruit". This genitive subject is a mandatory rule for the -ma / -mä participle!
Which version is more common to use: the relative clause with jonka or the agent participle with -ma?
They mean exactly the same thing, but the relative clause (jonka isoisä kasvatti) is much more common in everyday spoken Finnish. The agent participle (isoisän kasvattama) is very compact and is used heavily in written text, news, and formal speech.

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