Breakdown of Se on sinun näkökulmasi, jolla on ratkaiseva vaikutus.
olla
to be
se
it / he / she (of a person) / that
sinä
you
joka
who / which (relative pronoun)
Questions & Answers about Se on sinun näkökulmasi, jolla on ratkaiseva vaikutus.
Why is this sentence structured with Se on... jolla instead of just saying Sinun näkökulmallasi on ratkaiseva vaikutus?
This is a cleft sentence used for emphasis. By pulling sinun näkökulmasi out and introducing it with Se on (It is), the sentence heavily focuses on your perspective as opposed to anyone else's. It works exactly like the English 'It is your perspective that...'.
Why does the relative pronoun take the adessive form jolla instead of the base form joka?
A relative pronoun must always take the case required by its grammatical role inside the relative clause. Because the relative clause here expresses ownership ('that has a decisive effect'), it uses the Finnish 'have' construction. The 'owner' requires the adessive case -lla, so joka becomes jolla (jolla on = which has).
What kind of word is ratkaiseva?
It is the present active participle (the -va / -vä participle) of the verb ratkaista (to decide, to solve). While it literally means 'deciding', it is commonly used as a standard adjective meaning 'decisive' or 'crucial'.
Do we really need the -si suffix on näkökulmasi since the pronoun sinun is already there?
Yes, in standard written Finnish, the possessive suffix -si is strictly required when you use the genitive pronoun sinun. While in casual spoken Finnish people often drop the suffix and just say sun näkökulma, this sentence demonstrates proper written standard Finnish.