Raport, w którym widziałem prognozę, to oficjalne źródło.

Questions & Answers about Raport, w którym widziałem prognozę, to oficjalne źródło.

This lesson is about using 'według' (according to) + Genitive. How would we use that with the source mentioned in this sentence?
To say 'according to the official source', you use the Genitive case: według oficjalnego źródła. If you wanted to say 'according to the report', it would be według raportu.
Why does the sentence use w którym for 'in which'?
Który (which) is a relative pronoun that must match the noun it describes in gender and number. Since it refers to raport, a masculine noun, we use the masculine singular form. The preposition w (in) requires the Locative case here, making it w którym.
Why do we use to for 'is' here, and why is oficjalne źródło in the Nominative case?
When defining one noun as another (A is B), Polish commonly uses to. After to, the following noun phrase stays in the Nominative case. If you wanted to use the verb jest instead, the phrase would have to change to the Instrumental case: Raport... jest oficjalnym źródłem.
Why does the word for forecast change from prognoza to prognozę?
It is the direct object of the verb widziałem (I saw), so it must take the Accusative case. For feminine nouns ending in -a, the Accusative ending is .

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