Has Completed Vs. Had Completed Easy Grammar Rules

She has completed the marathon. The computer has completed running its diagnostics. He has completed filling out the forms.

I had completed my work when my friends showed up. They had completed their task before starting their next challenge. We had completed our homework, but we forgot it at home.

I have completed outlining my essay. You have completed listening to the podcast. I have completed my training.

They have completed their project. We have completed our assignment. The kids have completed their homework.