Noce bywają długie.

Breakdown of Noce bywają długie.

długi
long
noc
the night
bywać
to be
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Questions & Answers about Noce bywają długie.

What case and number is noce, and why does the singular noc change to noce here?
noce is the nominative plural form of noc. We use it because the sentence talks about nights as the subject in general. The noun noc undergoes a stem change in the plural: noc → noce.
Where is the stress in Noce bywają długie, and how should each word be pronounced?

Polish typically stresses the penultimate syllable. Pronunciation is:
Noce: NO-ce
bywają: by-WA-ją (the “ą” is a nasal vowel, like French “on”)
długie: DŁU-gie

What is the infinitive of bywają, and what nuance does this verb carry in this sentence?
bywają is the 3rd person plural present tense of the imperfective verb bywać (“to occur; to tend to be”). Here it means “nights tend to be” or “sometimes nights are,” implying that being long happens occasionally rather than always.
Why use bywają instead of the more straightforward (“are”)?

Using bywają adds a sense of irregularity or occasional occurrence.
Noce są długie would state “nights are long” as a fixed fact.
Noce bywają długie suggests “nights can be long” or “sometimes nights are long,” without making an absolute claim.

What form of the adjective długi is długie, and why does it end with -ie?
długie is the nominative plural form of długi used with non-masculine-personal nouns (feminine and neuter). Since noce is feminine plural, the adjective takes the feminine/non-personal plural ending -ie to agree in gender, number, and case.
How do adjectives agree with nouns in Polish?

In Polish, adjectives match the noun they modify in three categories:

  1. Gender (masculine, feminine, or neuter)
  2. Number (singular or plural)
  3. Case (nominative, accusative, etc.)
    In our sentence:
    noce is feminine plural nominative
    długie is also plural nominative with the appropriate ending -ie.
Could you say Noce są długie instead, and what difference would that make?

Yes, Noce są długie is grammatically correct. The difference is:
makes a direct, constant statement (“nights are long” as a rule).
bywają implies variability or that it occasionally happens (“nights can be long”).

How do you conjugate bywać in the present tense?

Present-tense conjugation of bywać is:
ja bywam (I tend to be)
ty bywasz (you tend to be)
on/ona/ono bywa (he/she/it tends to be)
my bywamy (we tend to be)
wy bywacie (you plural tend to be)
oni/one bywają (they tend to be)