Mühendis, kullanılmış malzemelerin çok dayanıksız olduğunu belirtmiş.

Questions & Answers about Mühendis, kullanılmış malzemelerin çok dayanıksız olduğunu belirtmiş.

Why is it malzemelerin with a genitive ending, instead of just malzemeler?
In Turkish complement clauses, the subject of the embedded clause takes the genitive case. Because the embedded clause here is 'the materials are fragile', the word for materials becomes malzemelerin. This links grammatically to the possessive suffix on olduğunu.
Since the materials are described by the adjective dayanıksız, why do we need olduğunu here?
Turkish complement clauses need a verb stem to attach the -dık suffix to. Because dayanıksız (fragile) is an adjective, we must use the helper verb olmak (to be) to carry the clause endings. It translates literally to the materials' 'being' fragile.
What exactly are the suffixes on olduğunu doing?
It breaks down as ol + -duğ (the -dık factive participle) + -u (3rd person possessive, pointing back to the materials) + -n- (buffer) + -u (accusative case marker). The accusative case is needed because this entire 'that...' clause is the direct object of the main verb belirtmiş.
Why use the -miş participle for kullanılmış malzemeler (used materials) instead of kullanılan?
Kullanılmış refers to a completed state, meaning materials that have already been used (like second-hand materials). If you used the present participle kullanılan, it would change the meaning to materials that are currently being used.
Why does the main sentence end with belirtmiş instead of the direct past tense belirtti?
Using the evidential -miş tense here shows that the speaker is reporting information they heard or read, rather than something they witnessed firsthand. It gives the sentence the nuance of 'The engineer reportedly stated...'

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