#$%@4-
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5452
 Did is used in past simple to form negative and interrogative sentences
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Pammi
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25692
"Did" is used as a helping verb in simple past tense when there is a verb in the given sentence. Ex:- Did you recognize him? She did not know about this.
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#$%@4-
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1
sub+did+v1 example :- she did her work sub past v1
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