Learn Farsi: بعضی از مدیران در اینکه این پروژه موفق می‌شود تردید دارند. - Some of the managers have doubt that this project will succeed.

The verb phrase tardid dāštan (to have doubt) requires the preposition dar (in) when connecting to a noun: to have doubt in something. When you want to connect it to a full clause ('that this project will succeed'), you cannot just attach dar directly to the clause. Instead, you use a placeholder, in (this), creating dar in ke (literally 'in this, that...').

Why is the verb mi-šavad in the indicative mood instead of the subjunctive? Doesn't expressing doubt usually trigger the subjunctive?

This is a great catch! While verbs of doubt often take the subjunctive, using dar in ke ('in the fact that') frames the following clause as a statement of a concrete outcome being discussed. The indicative mi-šavad emphasizes the objective fact of 'it succeeding' that is under debate. Using the subjunctive (bešavad) would also be grammatically correct here and would put more focus on the uncertainty of the event itself.

Why do we use ba'zi az modirān instead of just ba'zi modirān?

When ba'zi (some) is followed by a specific, plural noun like 'the managers', we use az (of) to say 'some of the managers' (ba'zi az modirān). While dropping az is possible, ba'zi az is much more common and natural when referring to a portion of a specific defined group.

The translation says 'will succeed', but isn't mi-šavad the present tense?