Question 1

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

Accepted Answer

-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.

Question 2

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

Accepted Answer

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.

Question 3

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

Accepted Answer

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.

Question 4

Can I say önemli bir ölçüde instead of önemli ölçüde?

Accepted Answer

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.

Question 5

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

Accepted Answer

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.

Question 6

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

Accepted Answer

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

Question 7

How do I negate this sentence?

Accepted Answer

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.”)

Question 8

How would I turn this into a question?

Accepted Answer

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?”)

Question 9

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

Accepted Answer

- 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.”

Kütüphanedeki gürültü önemli ölçüde azaldı.

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