کرده

In a sentence

• او این کار را تمام کرده است.

  He has finished this work.

  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.

• ما باید این مشکل را حل کرده باشیم.

  We should have solved this problem.

  Here, 'کرده' is used in conjunction with 'باشیم' to indicate having completed an action in a hypothetical, conditional, or subjective context.

• من کار را قبلاً کرده بودم.

  I had already done the 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.