Had done vs have done

Question

What's the difference between had done and have done?When should I use each?Thank you.

Avangi · Accepted Answer

We have done our homework. present perfect tense. Completed in the very recent past.

We had done our homework, so we were allowed to go to the movies.
past perfect tense. Completed in the past, prior to the simple past "act" of being allowed.

Note that the simple present of "to have," third person singular, is "has."
He has done his homework. The "done" remains in the base form, and does not change.
"Had" is simple past, and does not change for person or number:
He had done his homework, so he was allowed to go to the movies.

Anonymous · Answer

I am Arya Nair and I am a 2nd year master student in Electric Power Engineering. For the course EEK150: Power engineering, design project I choose to do the design project 7, Moving to DC-supply for end users – redesign of components.

The reason to write this mail is to meet you (The supervisor of this design project) and discuss some of my doubts. In the description it is

The reason to write this mail is to meet you (The supervisor of this design project) and discuss some of my doubts. In the description it is mentioned that our division had done some works in the past so I would like to study the previous work in this subject. From where can I get those information? Also I would like to discuss the opportunity of doing a Master thesis in this similar topic.

Even if this design project is in next study period I would like to start doing some preparations for this from now.

Once again thank you for your valuable time and consideration.

Bee candle 878 · Answer

Correct this sentence please. Immediately he ran to the injured man.

What is the error in this sentence? It was him you saw

Had done vs have done

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