Question 1

Why does the verb trebaju have a plural ending when pluća looks like a feminine singular noun?

Accepted Answer

Pluća ends in -a, which usually signals a feminine singular noun, but it is actually a neuter plural noun. Because the subject is plural, the verb must take the plural form, trebaju.

Question 2

I learned that trebati (to need) is often used impersonally with words like mi or ti. Why is it conjugated normally here?

Accepted Answer

When trebati is followed by a direct object noun (like čist zrak), it acts like a regular verb and matches the subject (pluća). The impersonal structure (like treba mi) is mostly used when the need involves an action, such as needing to do something.

Question 3

What case is čist zrak, and why do the words look exactly like their dictionary forms?

Accepted Answer

It is in the accusative case because it receives the action of the verb. However, zrak is a masculine inanimate noun (a non-living thing). For masculine inanimate nouns and their adjectives, the accusative form is identical to the nominative form.

Question 4

Why does the sentence use čist instead of the adjective form čisti?

Accepted Answer

Čist is the indefinite form of the adjective, whereas čisti is the definite form. Since the sentence makes a broad statement about any clean air rather than referring to a specific body of air, the indefinite form is used.

Pluća trebaju čist zrak.

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