Learn Turkish: Projenin kapsamı değiştiği takdirde sözleşmeyi feshederiz. - In the event that the scope of the project changes, we cancel the contract.

This is a formal conditional structure. It takes the verb değişmek (to change), adds the participle -dik, and attaches the 3rd person possessive suffix -i (matching the subject, kapsamı). Finally, it adds takdirde (in the event/case). This structure is typically used in contracts and official statements, making it much more formal than the standard conditional değişirse (if it changes).

Why is feshederiz written as one single word, and what is its root?

The verb is formed from the noun fesih (annulment/cancellation) and the auxiliary verb etmek (to do). When these combine, the second vowel in fesih drops out, making it feshetmek. Because of this vowel loss, Turkish spelling rules dictate they must be written together as a single word. Additionally, the t in etmek softens to a d because it is followed by the vowel in the aorist suffix -er.

Why use the aorist tense in feshederiz instead of the future tense (feshedeceğiz)?

In business and legal contexts, the aorist tense is commonly used to state standing policies, rules, or automatic consequences of a condition. While feshedeceğiz (we will cancel) is grammatically fine and focuses on a specific future action, feshederiz acts as a timeless contractual rule, similar to saying "it is our policy to cancel" or "we reserve the right to cancel."