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What is the difference between "had done" and "had did" ?

John had done this/it

and

John had did this/it

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    #1 is fine, #2 is ungrammatical.
    – Robusto
    Jan 10, 2018 at 2:22
  • @Robusto why second is grammatically incorrect ? Jan 10, 2018 at 2:24
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    Because the past participle of do is done, not did.
    – Robusto
    Jan 10, 2018 at 4:37

1 Answer 1

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In this case, as long as we are referring to an action in the past, we can say, "John had done it.", the past perfect form.

However, "John had did it" is incorrect. To form the past perfect, we need to use the past participle of "To do", which is "Done"

Note that using "This" implies a connection to the present, so the present perfect is required.

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  • Ok What if it was "it" instead of "this" ? Then what will be the difference. Jan 10, 2018 at 2:25
  • In the first sentence, using "it" and the past perfect would be OK as long as the action is relative to the past, like writing a story in the past tense. However, the second is still incorrect. "Did" is not the past participle of "To do". Jan 10, 2018 at 2:28
  • Ok got it now. Can you please update this in your answer too. Jan 10, 2018 at 2:29

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