The modal auxiliary of the Past – DID
The emphatic form:
Pronoun + modal + action
He did play
Negative phrases are essentially emphatic:
Pronoun + modal + negative + action
He did not play
The separation of the modal and negative elements produces a stronger hammered negative. When the two are contracted, the negative form becomes less marked, making the sound and our expression smoother:
Pronoun + modal /negative + action
He didn’t play
The modal DID is thrown behind the verb to reduce the emphatic weight in the affirmative:
Pronoun + action/ modal
He play (did)
The standard written form results in the -ed ending: He play -ed
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