Learn Turkish: Ödenek için projeyi bitirmeyi taahhüt etmiş olmak şarttır. - Having committed to finish the project is a condition for the grant funding.

The structure -mIş olmak creates a perfective infinitive. While taahhüt etmek means "to commit", using taahhüt etmiş olmak translates to "to have committed." It emphasizes that the act of committing must be a fully completed, existing state prior to getting the funding.

Why is there an accusative ending on bitirmeyi?

The verb taahhüt etmek (to commit to / to undertake) takes a definite direct object in the accusative case. Since the thing you are committing to is the action of "finishing" (bitirme), it requires the accusative suffix -yi.

We have projeyi and bitirmeyi right next to each other. Is it common to have back-to-back accusative words like this?

Yes, when they are the objects of different verbs in a chain. Projeyi is the direct object of bitirmek (finishing the project), and bitirmeyi is the direct object of taahhüt etmek (committing to finishing). Each verb independently governs its own object.

What does the -tır suffix add to şarttır here?