Breakdown of Po podmianie wody musisz dodać nawóz.
woda
water
musieć
to have to
po
after; for (to fetch)
dodać
to add
nawóz
fertilizer
podmiana
water change
Questions & Answers about Po podmianie wody musisz dodać nawóz.
Why use podmiana instead of zmiana or wymiana here?
Polish has several words for 'change'. Zmiana is a general change, and wymiana usually means a complete replacement or exchange. Podmiana implies a partial replacement or a discrete substitution. In the context of aquariums or plants, you usually change out a portion of the water, making podmiana the most accurate choice.
Why is podmianie in the Locative case here?
The preposition po requires the Locative case when it means 'after' in a temporal sense. Since podmiana is a feminine noun, it takes the -ie ending in the Locative. This ending also triggers a consonant softening, changing the stem from n to ni, which gives us podmianie.
Why is wody in the Genitive case instead of being the direct object?
Wody is in the Genitive case because it modifies the noun before it (podmianie), not the verb. In Polish, when a noun belongs to or specifies another noun—like 'the change of the water' in English—the second noun takes the Genitive case.
Why do we use the perfective dodać after the modal verb musisz?
The perfective dodać is used because the sentence refers to a specific, one-time action that needs to be completed after this particular water change. If the sentence was describing a continuous or habitual rule, like 'you must always add fertilizer', it would use the imperfective form dodawać.
Since nawóz is the direct object of dodać, why doesn't its ending change?
It actually is in the Accusative case here, which is the required case for a direct object. However, nawóz (fertilizer) is a masculine inanimate noun. For masculine inanimate nouns, the Accusative form is identical to the Nominative (dictionary) form, so it looks like it hasn't changed.
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