Kütüphanedeki gürültü önemli ölçüde azaldı.

The noise in the library has significantly decreased.

Breakdown of Kütüphanedeki gürültü önemli ölçüde azaldı.

• gürültü: the noise
• kütüphane: the library
• azalmak: to decrease
• -deki: in
• önemli ölçüde: significantly

Questions & Answers about Kütüphanedeki gürültü önemli ölçüde azaldı.

What is the function of the suffix -deki in kütüphanedeki?

-deki is actually two suffixes: -de (the locative case, meaning “in/at”) and -ki (a relativizer that turns a location into an adjective phrase). Together they make kütüphanedeki mean “in the library” when modifying another noun such as gürültü.

How do I decide between -de, -da, -te, and -ta for the locative suffix?

Turkish locative suffixes follow two harmony rules:
1) Vowel harmony: choose -de after front vowels (e, i, ö, ü) and -da after back vowels (a, ı, o, u).
2) Consonant harmony (voicing): if the noun ends in a voiceless consonant (p, t, k, ç), the suffix uses t instead of d (e.g. kitap → kitapta, ev → evde).
Since kütüphane ends in the front vowel e, and the preceding sound is voiced, we use -de, giving kütüphanede, then add -ki.

What does önemli ölçüde mean, and why is there a -de on ölçü?

Literally, ölçü means “measure,” and -de here acts like “to the measure,” forming an adverbial expression. önemli ölçüde therefore means “to an important measure,” i.e. “significantly.” It’s a fixed phrase: adjective + noun + locative turning into an adverbial intensity marker.

Can I say önemli bir ölçüde instead of önemli ölçüde?

Yes. Adding the indefinite article bir (“a”) is common and equally clear: önemli bir ölçüde. Turkish often allows dropping bir in such expressions without changing the meaning.

Which tense and person is azaldı, and how is it built?

azaldı is the simple past, third-person singular form of the intransitive verb azalmak (“to decrease”).
Breakdown: azal- (stem) + -dı (past tense suffix, harmonized as -dı) + zero personal ending for 3rd sg.

Why is the verb placed at the end of the sentence?

Turkish follows a Subject–Object–Verb (SOV) order and places adverbial modifiers before the verb. Here:
Subject: Kütüphanedeki gürültü
Adverbial: önemli ölçüde
Verb: azaldı

How do I negate this sentence?

Insert the negative prefix -ma/-me before the tense suffix:
azal- + -ma + -dı → azalmadı
Full negative: Kütüphanedeki gürültü önemli ölçüde azalmadı (“The noise in the library did not decrease significantly.”)

How would I turn this into a question?

You can add the question particle mi after the verb (with appropriate vowel harmony) or rely on intonation. For example:
Kütüphanedeki gürültü önemli ölçüde azaldı mı? (“Did the noise in the library decrease significantly?”)

What is a literal word-by-word breakdown of this sentence?

• kütüphanedeki = library-Locative-Relativizer = “in the library” (as modifier)
• gürültü = “noise”
• önemli = “important/significant”
• ölçüde = measure-Locative = “to the measure” → “to a degree”
• azaldı = decreased (past tense)
  Together: “The noise in the library decreased to a significant measure.”