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Wydajność tej turbiny wiatrowej jest bardzo duża.

Wydajność tej turbiny wiatrowej jest bardzo duża.
The efficiency of this wind turbine is very high.
From Lesson 482:Dependency prepositions (w zależności od)·Polish

Questions & Answers about Wydajność tej turbiny wiatrowej jest bardzo duża.

Why do we use duża (big) here instead of a word for "high" to describe efficiency?
In Polish, abstract measurements like wydajność (efficiency, performance) are frequently described as duża (big) or mała (small). While you might also hear wysoka wydajność (high efficiency), using duża is standard and very natural.
How would I apply this lesson's grammar to say "depending on the efficiency of this wind turbine"?
You would say w zależności od wydajności tej turbiny wiatrowej. The compound preposition w zależności od requires the Genitive case. The noun wydajność changes to wydajności in the Genitive, while tej turbiny wiatrowej is already in the Genitive so it stays exactly the same.
Why is tej turbiny wiatrowej already in the Genitive case in the original sentence?
It is in the Genitive case to express possession or relationship, translating directly to "of this wind turbine". It modifies the noun wydajność to specify what exactly is being measured.
What is the root word of wydajność, and how can I easily remember its gender?
The root is the adjective wydajny (efficient). By adding the suffix -ość (similar to "-ity" or "-ness" in English), it becomes an abstract noun. Almost all nouns ending in -ość in Polish are feminine, which is why it pairs with the feminine adjective duża.

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