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English definition of “do”

do

auxiliary verb     strong /duː/ weak //
QUESTIONS/NEGATIVES A1 used with another verb to form questions and negative phrases: Do you need any help? When does the next bus leave? I don't know.Questioning people and asking questions in generalCuriositySuspecting and questioning
MAKE QUESTION A2 used in a phrase at the end of a sentence to make it into a question: Sarah lives near here, doesn't she? That doesn't make any sense, does it?Question words and expressions
AVOID REPEATING B1 used to avoid repeating a verb that has just been used: "I hate that song." "So do I." My sister reads a lot more than I do.
EMPHASIZE B2 used to emphasize the main verb: He does like you, he's just shy. Do come and visit us soon.Stressing and emphasizing
(Definition of do auxiliary verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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