When referring to a photo accidentally taken, which is better "I must have did that this morning" or "I must have done that this morning"
gray slide 202 must have did That is not possible English. gray slide 202 must have done OK.
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gray slide 202must have did
That is not possible English.
gray slide 202must have done
OK.
Auxiliary 'have' must take a past participle (done). That's the only possible choice.
must have taken / must have seen / must have brought / must have gone
CJ