چکا

In a sentence

• میں اپنا کام مکمل کر چکا ہوں۔

  I have finished my work.

  The word "چکا" is used here to indicate that the action of finishing the work has been completed in the past.

• وہ رات کا کھانا کھا چکا تھا۔

  He had eaten dinner.

  In this sentence, "چکا" shows the completion of the action of eating dinner before a reference point in the past.

• ہم نے یہ فلم پہلے ہی دیکھ چکے ہیں۔

  We have already watched this movie.

  Here, "چکا" is used to express the completion of the action of watching the movie at a time prior to the current moment.