Did in a sentence

How did you know what I was doing?
Arthur Conan Doyle, The Hound of Baskervilles

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Dictionary

Merriam-Webster
— past tense of DO
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Macmillan
— the past tense of do
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Other Word Forms

do
does
doing
done


Usage

113 uses of ‘did’ in The Hound of the Baskervilles, by Arthur Conan Doyle