sürdürdüünü

Sürdürdüünü is not a recognized word in standard Turkish and does not appear in major dictionaries or conventional Turkish corpora. It is likely a typographical error, a transcription artifact, or a nonstandard/fictional coinage rather than a legitimate Turkish lexical item.

In Turkish, the closest standard form is sürdurdüğünü (or sürdürdüğünü), derived from the verb sürdürmek, which means to continue, sustain, or prolong. The base form sürdürmek combines the root sürdür- with the infinitive suffix -mek. The past tense third-person singular form is sürdürdü. To introduce a reported clause such as “that he continued,” Turkish uses the relative clause suffix -düğünü (or -duğunu, depending on vowel harmony), yielding sürdürdüğünü meaning “that he continued.” Therefore, sürdürdüünü does not conform to Turkish phonology or morphology and would be considered incorrect in formal Turkish.

Common related forms include sürdürdü (he continued), sürdürdü mü/ sürdürdü mü? (did he continue?), and sürdürdüğünü (that he continued). These forms are used in standard sentences such as: “O, projeyi sürdürdüğünü söyledi” (He said that he continued the project) or “Sürdürdüğünü bilmek sevindirici” (It is reassuring to know that he continued it). When analyzing a text, appearances of sürdürdüünü are typically treated as a misspelling or typographical error rather than a legitimate grammatical variant.

See also: Turkish verbs of continuation, the verb sürdürmek, Turkish relative clauses formed with -düğünü/-duğunu.