This is the 18th most frequent Persian word.
کرده
"کرده" means "done" or "has done" depending on the context.
In this sentence, 'کرده' is used as a past participle to indicate a completed action in conjunction with the auxiliary verb 'است' to form the present perfect tense.
او این کار را تمام کرده است.
He has finished this work.
In this example, 'کرده' forms part of the past perfect tense, paired with the auxiliary 'بودم' to indicate a prior completed action at a given point in the past.
من کار را قبلاً کرده بودم.
I had already done the work.
Here, 'کرده' is used in conjunction with 'باشیم' to indicate having completed an action in a hypothetical, conditional, or subjective context.