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English definition of “do”


auxiliary verb (TO AVOID REPEATING)   /du/ (present tense does  /dʌz, dəz/, past tense did  /dɪd/, past participle done  /dʌn/)
used to avoid repeating a verb or verb phrase: "I don’t like either candidate." "Neither do I." He said he’d leave the car in the garage, but he didn’t. "May I join you?" "Please do!" "Did you leave the door open?" "Yes, I did." Do can also replace the main verb in questions that are added to the end of a sentence: You met him at a conference, didn’t you?
(Definition of do auxiliary verb (TO AVOID REPEATING) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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